# A091740 (b-file synthesized from sequence entry)
2 1
3 290
4 71320
5 22097600
6 8928102400
7 4644244774400
8 3046988353024000
9 2470747704449024000
10 2431736840968314880000
11 2859398101389251502080000
12 3962371103307529193881600000
13 6394280010754055221811609600000