# A026080 (b-file synthesized from sequence entry) 0 1 1 2 2 4 3 7 4 22 5 64 6 191 7 567 8 1689 9 5033 10 15013 11 44809 12 133816 13 399802 14 1194949 15 3572693 16 10684758 17 31962456 18 95633229 19 286193409 20 856610214 21 2564317356 22 7677475521 23 22988860305 24 68843627049 25 206183053485 26 617563017927 27 1849887488987