# A176904 (b-file synthesized from sequence entry) 0 3 1 8 2 24 3 64 4 7776 5 20736 6 13824 7 36864 8 45349632 9 120932352 10 80621568 11 214990848 12 322486272 13 859963392 14 573308928 15 1528823808 16 1028294561267712 17 2742118830047232 18 1828079220031488 19 4874877920083968 20 7312316880125952