# A073951 (b-file synthesized from sequence entry) 1 0 2 1 3 3 4 6 5 21 6 81 7 252 8 729 9 2187 10 6642 11 19845 12 59049 13 176904 14 531441 15 1594323 16 4780782 17 14344533 18 43046721 19 129146724 20 387420489 21 1162261467 22 3486843450 23 10460471301 24 31381059609 25 94143001680 26 282429536481 27 847288609443 28 2541864234006 29 7625594296341