# A228080 (b-file synthesized from sequence entry)
0 1
1 2520
2 7484400
3 22870848000
4 70579794285000
5 218799620836917120
6 679953587124305894400
7 2116187746296592370688000
8 6592431144164903462359935000
9 20550499897066845200729434200000
10 64091912654977017603465324370118400
11 199956261330234671205699024876891648000