# A253094 (b-file synthesized from sequence entry)
0 1
1 -5
2 6
3 2
4 6
5 18
6 66
7 278
8 1296
9 6528
10 34950
11 196578
12 1151610
13 6981102
14 43570170
15 278841438
16 1823991630
17 12162884778
18 82498605594
19 568140045918
20 3966323992074
21 28032955095198
22 200355706872054
23 1446628270673682
24 10542888272710224
25 77496225169484448