# A156075 (b-file synthesized from sequence entry) -1 1 0 3 1 10 2 60 3 560 4 6960 5 108160 6 2016960 7 43880960 8 1091055360 9 30518978560 10 948529167360 11 32428291727360 12 1209444693749760 13 48866368072744960 14 2126271870148853760 15 99126722911299829760 16 4929370112679276380160 17 260448010952742716047360 18 14570492989330164551516160