# A148392 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 16 5 52 6 178 7 625 8 2229 9 8292 10 31844 11 123850 12 487577 13 1939259 14 7783926 15 31652369 16 130184871 17 539206880 18 2246282327 19 9408346891 20 39623252299 21 167927239399 22 715732297981 23 3063454084931 24 13158541339027 25 56712257652225 26 245295621094005 27 1064945938445083 28 4639147279079300