# A055603 (b-file synthesized from sequence entry)
1 0
2 1
3 90
4 2248
5 43000
6 755100
7 13003620
8 226262400
9 4037765760
10 74481120000
11 1425927888000
12 28389466828800
13 588245898240000
14 12685887076262400
15 284623499160000000
16 6639289429893120000
17 160886197351047168000
18 4046412223559946240000
19 105527367894862577664000