# A045686 (b-file synthesized from sequence entry) 0 0 1 0 2 0 3 0 4 0 5 0 6 2 7 2 8 8 9 14 10 36 11 62 12 140 13 252 14 522 15 968 16 1920 17 3600 18 7028 19 13286 20 25704 21 48914 22 94302 23 180314 24 347480 25 666996 26 1286460 27 2477328 28 4785300 29 9240012 30 17879314 31 34604066 32 67076096 33 130084990 34 252579600 35 490722342 36 954306080