# A054544 (b-file synthesized from sequence entry) 0 1 1 1 2 2 3 3 4 9 5 70 6 117 7 503 8 648 9 1078 10 12868 11 41235 12 178650 13 377670 14 394301 15 546185 16 2600672 17 8729780 18 41318679 19 83367169 20 525961060 21 561571346 22 1556964264 23 1868773845 24 15139200289 25 27297789005 26 30324107039 27 56699922000