# A006294 (b-file synthesized from sequence entry) 0 1 1 1 2 5 3 22 4 164 5 1030 6 8885 7 65954 8 614404 9 5030004 10 49145460 11 429166584 12 4331674512 13 39599553708 14 409230997461 15 3871362876810 16 40730958917220 17 395684757649324 18 4222043580320852 19 41894315105061848 20 452123832420881296