# A012855 (b-file synthesized from sequence entry) 0 0 1 1 2 1 3 1 4 2 5 7 6 28 7 114 8 465 9 1897 10 7739 11 31572 12 128801 13 525456 14 2143648 15 8745217 16 35676949 17 145547525 18 593775046 19 2422362079 20 9882257736 21 40315615410 22 164471408185 23 670976837021 24 2737314167775 25 11167134898976