# A261885 (b-file synthesized from sequence entry)
0 0
1 3
2 -6
3 33
4 -288
5 3240
6 -41328
7 538776
8 -6772608
9 108502848
10 -3985200000
11 160423053120
12 -1094935449600
13 -334098799856640
14 6171528273039360
15 2583214608931891200
16 -150276838897808179200
17 -27910708844766496358400
18 3428432556793417713254400
19 462153194693572097337753600
20 -107869378361311784037187584000