# A091550 (b-file synthesized from sequence entry)
2 1
3 160
4 39900
5 15120000
6 8202070800
7 6058891238400
8 5860547004312000
9 7196668193594880000
10 10944624305020966560000
11 20199809308312018344960000
12 44490168120726255724917120000
13 115290834599202214240544256000000