# A081684 (b-file synthesized from sequence entry)
0 1
1 -1
2 -1
3 29
4 275
5 1829
6 10739
7 59429
8 318275
9 1670789
10 8656979
11 44454629
12 226827875
13 1151991749
14 5830280819
15 29429454629
16 148249811075
17 745630312709
18 3745590106259
19 18797445635429
20 94264432179875
21 472428649241669
22 2366562219717299
23 11850466059333029
24 59322887352366275
25 296896476647946629