Question 884472
Any of them could be.
That is the nature of sequences.
a)84
1      0       1       0       -1      12      -52     209
1      1       1       -1      11      -40     157     209
2      2       0       10      -29     117     366
4      2       10      -19     88      483
6      12      -9      69      571
18     3       60      640
21     63      700
84     763
847
9th term 847
b 63
1      0       1       0       -1      12      -52     188
1      1       1       -1      11      -40     136     188
2      2       0       10      -29     96      324
4      2       10      -19     67      420
6      12      -9      48      487
18     3       39      535
21     42      574
63     616
679
9th term 679

c 78
1      0       1       0       -1      12      -52     203
1      1       1       -1      11      -40     151     203
2      2       0       10      -29     111     354
4      2       10      -19     82      465
6      12      -9      63      547
18     3       54      610
21     57      664
78     721
799
9th term 799

d) 28
1      0       1       0       -1      12      -52     153
1      1       1       -1      11      -40     101     153
2      2       0       10      -29     61      254
4      2       10      -19     32      315
6      12      -9      13      347
18     3       4       360
21     7       364
28     371
399
9th term 399

84
Multiply by 1, add 1, multiply by 2, add 2, etc.