# A009697 (b-file synthesized from sequence entry) 0 0 1 1 2 2 3 7 4 20 5 117 6 518 7 4555 8 27432 9 317577 10 2405194 11 34316335 12 312554428 13 5287957053 14 56240197198 15 1099518892339 16 13369846932560 17 296443784525713 18 4056020122211730 19 100546719214082775 20 1528702557462347620