# A012255 (b-file synthesized from sequence entry)
0 1
1 1
2 1
3 0
4 -3
5 -4
6 21
7 136
8 185
9 272
10 9641
11 222016
12 1668021
13 21267520
14 192801597
15 3836913536
16 42064398961
17 874251520256
18 10576096455505
19 254117293340672
20 3476312353756781
21 92635637659667456