# A013139 (b-file synthesized from sequence entry)
0 1
1 4
2 80
3 4288
4 426240
5 67920896
6 15873495040
7 5113806962688
8 2172417489305600
9 1176644688113041408
10 791421023406538096640
11 647183647775891247857664
12 632330839348840678513704960