3 | 1 5 6 -7 -3 3 24 90 249 --------------------- 1 8 30 83 246 Drop the 1, 3 times 1 is 3, 3 under the 5, 5 and 3 is 8, 3 times 8 is 24, 24 under the 6, 6 and 24 is 30, 3 times 30 is 90, 90 under the -7, 90 and -7 is 83, 3 times 83 is 249, 249 under the -3, -3 and 249 is 246.