# A073083 (b-file synthesized from sequence entry) 1 1 2 10 3 12 4 24 5 615 6 4066 7 7960 8 30432 9 49260 10 133686 11 440286 12 1201644 13 6640812 14 126953125 15 411106256 16 1046704882 17 11046706752 18 44588839041