# A051844 (b-file synthesized from sequence entry) 0 2 1 6 2 30 3 90 4 1530 5 16830 6 218790 7 9407970 8 2417848290 9 137817352530 10 28252557268650 11 19296496614487950 12 4650455684091595950 13 12700394473254148539450 14 41619192688853844763777650 15 13775952780010622616810402150 16 902834617343556174437903325704550