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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 2 |
| 3 | 5 |
| 4 | 19 |
| 5 | 65 |
| 6 | 259 |
| 7 | 1161 |
| 8 | 5927 |
| 9 | 33946 |
| 10 | 216090 |
| 11 | 1513051 |
| 12 | 11558614 |
| 13 | 95658445 |
| 14 | 852571616 |
| 15 | 8141450460 |
| 16 | 82928132445 |
| 17 | 897492637757 |
| 18 | 10284508144797 |
| 19 | 124399102620413 |
| 20 | 1583898570128385 |
| 21 | 21175164077080102 |
| 22 | 296571619014584968 |
| 23 | 4342477201229994035 |
| 24 | 66348164337987642924 |
[0,1,2,5,19,65,259,1161,5927,33946,216090,1513051, 11558614,95658445,852571616,8141450460, 82928132445,897492637757,10284508144797, 124399102620413,1583898570128385, 21175164077080102,296571619014584968, 4342477201229994035,66348164337987642924] |