# A005953 (b-file synthesized from sequence entry) 0 1 1 0 2 566 3 1280 4 12188 5 12800 6 75304 7 58880 8 275126 9 179200 10 757240 11 441600 12 1711224 13 949760 14 3405696 15 1799680 16 6261404 17 3138560 18 10613550 19 5216000 20 16987640