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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 3 |
| 4 | 7 |
| 5 | 23 |
| 6 | 92 |
| 7 | 502 |
| 8 | 1880 |
| 9 | 12008 |
| 10 | 66730 |
| 11 | 516610 |
| 12 | 3194229 |
| 13 | 29181056 |
| 14 | 224463264 |
| 15 | 2481941592 |
| 16 | 18805353654 |
| 17 | 203330533890 |
| 18 | 1845535279170 |
| 19 | 25328291231632 |
| 20 | 244141112078994 |
| 21 | 3361871786122320 |
| 22 | 39998248932957744 |
| 23 | 674899378544965360 |
| 24 | 7394457611253245344 |
[1,1,1,3,7,23,92,502,1880,12008,66730,516610, 3194229,29181056,224463264,2481941592,18805353654, 203330533890,1845535279170,25328291231632, 244141112078994,3361871786122320, 39998248932957744,674899378544965360, 7394457611253245344] |