# A326324 (b-file synthesized from sequence entry) 0 1 1 1 2 6 3 46 4 456 5 5656 6 84336 7 1467376 8 29175936 9 652606336 10 16219458816 11 443419545856 12 13224580002816 13 427278468668416 14 14867050125981696 15 554245056343668736 16 22039796215883268096 17 931198483176870608896 18 41658202699736550014976 19 1967160945260218035798016