# A052872 (b-file synthesized from sequence entry)
0 1
1 1
2 3
3 9
4 32
5 117
6 460
7 1850
8 7680
9 32467
10 139631
11 608280
12 2679881
13 11916492
14 53417407
15 241118245
16 1095030281
17 4999847240
18 22938576846
19 105690791104
20 488860041249
21 2269080989966
22 10565660913109
23 49340702712984
24 231031730790560