# A013007 (b-file synthesized from sequence entry)
0 1
1 4
2 80
3 4384
4 436992
5 70425984
6 16592126976
7 5395435991040
8 2312302178205696
9 1263775007737085952
10 857643638399523454976
11 707659940568946007474176
12 697634806106676807565574144