# A019308 (b-file synthesized from sequence entry)
0 1
1 3
2 6
3 18
4 48
5 144
6 414
7 1242
8 3678
9 11034
10 32958
11 98874
12 296208
13 888624
14 2664630
15 7993890
16 23977992
17 71933976
18 215790894
19 647372682
20 1942085088
21 5826255264
22 17478666918
23 52436000754
24 157307706054
25 471923118162