(Translated by https://www.hiragana.jp/)
# A162868 (b-file synthesized from sequence entry)
0 1
1 2
2 40
3 4680
4 1591200
5 1891936800
6 4270101357600
7 11089453225687200
8 32565776278494961756800
9 28429922691126101613686400
10 42204464874461454985621846571472000