# A334656 (b-file synthesized from sequence entry) 0 1 1 0 2 4 3 9 4 24 5 90 6 225 7 756 8 2160 9 6561 10 19764 11 58806 12 177633 13 530712 14 1595052 15 4782969 16 14346720 17 43053282 18 129127041 19 387440172 20 1162241784 21 3486784401 22 10460412252 23 31380882462 24 94143533121 25 282429005040 26 847289140884 27 2541865828329 28 7625595890664