# A099967 (b-file synthesized from sequence entry) 0 1 1 2 2 3 3 5 4 10 5 23 6 51 7 128 8 386 9 1092 10 3370 11 12458 12 43037 13 158638 14 691999 15 2827035 16 12150430 17 60980759 18 287737037 19 1414689552 20 8021603122 21 42939104470 22 237864297110 23 1502870474645 24 8999347646633 25 55484973357830