# A064087 (b-file synthesized from sequence entry) 0 1 1 1 2 5 3 41 4 413 5 4641 6 55797 7 702297 8 9137549 9 121909457 10 1658755685 11 22929591433 12 321111942781 13 4546112358529 14 64958195967957 15 935566629270201 16 13567825195172973 17 197957440018622769 18 2903721563443327557 19 42796201522669935081 20 633443408407612143453