1st term = 31+1 = 3+1 = 4 2nd term = 32-1 = 9-1 = 8 3rd term = 33+1 = 27+1 = 28 4th term = 34-1 = 81-1 = 80 5th term = 35+1 = 243+1 = 244 6th term = 36-1 = 729-1 = 728 7th term = 37+1 = 2187+1 = 2188 8th term = 38-1 = 6561-1 = 6560 9th term = 39+1 = 19683+1 = 19684 10th term = 310-1 = 59049-1 = 59048 11th term = 311+1 = 177147+1 = 177148 12th term = 312-1 = 531441-1 = 531440 13th term = 313+1 = 1594323+1 = 1594324 14th term = 314-1 = 4782969-1 = 4782968 15th term = 315+1 = 14348907+1 = 14348908 16th term = 316-1 = 43046721-1 = 43046720 17th term = 317+1 = 129140163+1 = 129140164 18th term = 318-1 = 387420489-1 = 387420488 19th term = 319+1 = 1162261467+1 = 1162261468 20th term = 320-1 = 3486784401-1 = 3486784400 ... Edwin
