# A174318 (b-file synthesized from sequence entry) 0 1 1 1 2 1 3 3 4 9 5 45 6 265 7 1855 8 14833 9 133497 10 1334961 11 14684571 12 176214841 13 2290792933 14 32071101049 15 481066515735 16 7697064251745 17 130850092279665 18 2355301661033953 19 44750731559645107 20 895014631192902121 21 18795307255050944541 22 413496759611120779881