# A074084 (b-file synthesized from sequence entry) 0 0 1 0 2 0 3 2 4 9 5 32 6 102 7 306 8 883 9 2480 10 6828 11 18514 12 49597 13 131568 14 346194 15 904738 16 2350695 17 6076960 18 15641304 19 40103778 20 102473969 21 261046144 22 663180222 23 1680628946 24 4249496795 25 10722962256 26 27007159428 27 67904097074