# A187010 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 4 4 8 5 20 6 65 7 189 8 545 9 1672 10 5234 11 16483 12 52508 13 168948 14 547031 15 1782892 16 5851234 17 19308826 18 64012154 19 213130527 20 712361672 21 2389177656 22 8038552120 23 27125159211 24 91774118484 25 311265968741 26 1058099992873 27 3604394906225