# A028531 (b-file synthesized from sequence entry)
0 1
1 0
2 275
3 1496
4 7931
5 31240
6 109516
7 341176
8 988031
9 2671856
10 6849942
11 16750912
12 39391297
13 89436072
14 196915917
15 421732432
16 881208933
17 1800324328
18 3603551358
19 7078487944
20 13665932995
21 25964272664
22 48601312255
23 89719964136
24 163490906337
25 294312308576