# A144277 (b-file synthesized from sequence entry) 0 1 1 2 2 14 3 100 4 1140 5 14880 6 249280 7 4801280 8 108574400 9 2767072000 10 79286592000 11 2508856627200 12 87115395136000 13 3287694620672000 14 134073047499776000 15 5872147278807040000 16 274939690654024704000 17 13701683362561818624000 18 724128149433185136640000