# A306789 (b-file synthesized from sequence entry)
0 1
1 2
2 18
3 800
4 183750
5 224042112
6 1475939646720
7 53195808994099200
8 10587785727897772143750
9 11721562427290210695200000000
10 72596493516095364770534596279431168
11 2527156530619699341247423878706695556300800
12 496395279097923766533851314609410101501472675840000