# A097235 (b-file synthesized from sequence entry)
-1 1
0 3
1 90
2 945
3 12600
4 53460
5 10216206000
6 1021620600
7 534386160000
8 2494674910728000
9 2744142401800800000
10 1456506351725040000
11 68921880563628892800000
12 39762623402093592000000