# A149376 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 12 4 48 5 165 6 711 7 2765 8 12230 9 50199 10 227229 11 970714 12 4459345 13 19565405 14 90903964 15 406827818 16 1906585122 17 8662077597 18 40874264328 19 187908308360 20 891647946915 21 4138130214503 22 19726740618496 23 92263851819229 24 441537841755276 25 2078452663508263 26 9979603884251570 27 47232397814709432