# A153993 (b-file synthesized from sequence entry) 0 1 1 2 2 2 3 4 4 8 5 12 6 23 7 90 8 162 9 611 10 2402 11 8560 12 32187 13 246141 14 874521 15 6300203 16 48576212 17 330649842 18 2414376086 19 35637800561 20 246608696517 21 3459350545304 22 51985154551969 23 691390369850685 24 9855466810408009 25 284813053880252248