# A088013 (b-file synthesized from sequence entry)
0 1
1 1
2 4
3 10
4 36
5 116
6 400
7 1352
8 4624
9 15760
10 53824
11 183712
12 627264
13 2141504
14 7311616
15 24963200
16 85229824
17 290992384
18 993510400
19 3392055808
20 11581203456
21 39540700160
22 135000395776
23 460920178688
24 1573679927296
25 5372879343616