# A026938 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 5 4 12 5 30 6 76 7 196 8 518 9 1422 10 3915 11 10813 12 29964 13 83304 14 232323 15 649845 16 1822824 17 5147328 18 14727168 19 42171849 20 120870324 21 346757334 22 995742748 23 2862099185 24 8234447672 25 23713180780 26 68350541480 27 197188167735