# A027251 (b-file synthesized from sequence entry) 0 1 1 3 2 10 3 27 4 76 5 195 6 519 7 1299 8 3364 9 8311 10 21191 11 51981 12 131273 13 320715 14 804845 15 1961823 16 4901782 17 11932489 18 29719325 19 72291325 20 179610365 21 436699813 22 1082870377 23 2632116551 24 6516122403 25 15835522783 26 39147779575