# A304677 (b-file synthesized from sequence entry) 0 1 1 1 2 4 3 9 4 27 5 60 6 170 7 377 8 996 9 2288 10 5715 11 13002 12 32321 13 72864 14 175137 15 400039 16 943454 17 2133159 18 4993737 19 11236889 20 25995341 21 58480330 22 133650880 23 299347432 24 681346296 25 1519116099 26 3427954877 27 7631479391 28 17122129103 29 37958987956 30 84819325972 31 187405201004