# A141380 (b-file synthesized from sequence entry) 1 1 2 1 3 2 4 8 5 32 6 138 7 624 8 2922 9 14036 10 68788 11 342584 12 1728812 13 8820864 14 45428616 15 235846688 16 1232970010 17 6485204532 18 34295308230 19 182233431688 20 972493015258 21 5209848971700 22 28008206873944 23 151053157070944 24 817032258098112