# A019499 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 1 4 1 5 5 6 15 7 35 8 70 9 146 10 360 11 980 12 2620 13 6620 14 16276 15 40740 16 105820 17 280780 18 743700 19 1950756 20 5101470 21 13429110 22 35693650 23 95433290 24 255434106 25 683340050 26 1829832350 27 4913953750 28 13239959100 29 35758234300 30 96702404700 31 261768987260 32 709479051420