# A308817 (b-file synthesized from sequence entry) 1 1 2 4 3 10 4 26 5 56 6 138 7 299 8 726 9 1686 10 4158 11 10130 12 25678 13 64725 14 166538 15 428456 16 1112226 17 2888604 18 7533750 19 19653903 20 51367462 21 134277878 22 351284164 23 919080550 24 2405427698 25 6295780309 26 16480373968 27 43141303978 28 112939105716 29 295664584064 30 774042041090 31 2026429360115 32 5305210333758