# A148513 (b-file synthesized from sequence entry) 0 1 1 1 2 3 3 5 4 17 5 36 6 132 7 324 8 1249 9 3384 10 13513 11 39254 12 160933 13 492667 14 2061281 15 6573859 16 27953711 17 92135701 18 396995905 19 1344484187 20 5857194879 21 20293100945 22 89231953988 23 315216303132 24 1397145357480 25 5018909316758 26 22399731055518 27 81651914667098 28 366629319842832 29 1353795080618278 30 6111309663883855