# A047027 (b-file synthesized from sequence entry) 0 1 1 3 2 9 3 28 4 95 5 331 6 1169 7 4234 8 15533 9 57410 10 214396 11 806324 12 3046963 13 11575473 14 44163245 15 169039223 16 649096030 17 2499407973 18 9646255701 19 37309138495 20 144580572524 21 561217993364 22 2181849519347 23 8494360042301 24 33111979073980