# A073403 (b-file synthesized from sequence entry) 0 1 1 12 2 36 3 120 4 888 5 1536 6 1152 7 15168 8 62592 9 80448 10 10944 11 222336 12 1600704 13 4813056 14 5068800 15 103680 16 2992896 17 32811264 18 169917696 19 413351424 20 375598080 21 981504 22 38112768 23 587976192 24 4592982528