# A062474 (b-file synthesized from sequence entry) 1 0 2 1 3 3 4 16 5 60 6 192 7 552 8 1439 9 3469 10 7836 11 16746 12 34119 13 66688 14 125668 15 229261 16 406311 17 701575 18 1183187 19 1953088 20 3161413 21 5026098 22 7859320 23 12102784 24 18374396 25 27529455 26 40740236 27 59598715 28 86248245 29 123551209 30 175301158