# A305108 (b-file synthesized from sequence entry)
0 1
1 1
2 12
3 342
4 16080
5 1090400
6 99884736
7 11885278104
8 1786708056832
9 331931252093472
10 74805826012157600
11 20127855750577630968
12 6377560491906482613120
13 2351353212746078192866032
14 998307775668524681354287776
15 483648245019895895020555792200
16 265226237170176555086800587134976
17 163463812810277012465203148994919744
18 112505648337664454361768261713783693856