# A149836 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 10 4 30 5 96 6 331 7 1182 8 4330 9 16440 10 63666 11 250784 12 1006836 13 4092702 14 16835669 15 70046157 16 293951828 17 1244027689 18 5304687807 19 22764368479 20 98291087090 21 426708971095 22 1861521206586 23 8158363043442 24 35903249248079 25 158607676019653 26 703176242526440 27 3127677546748113 28 13954219633996737