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| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 1 |
| 4 | 14 |
| 5 | 27 |
| 6 | 165 |
| 7 | 428 |
| 8 | 2001 |
| 9 | 6069 |
| 10 | 25042 |
| 11 | 82555 |
| 12 | 319793 |
| 13 | 1101816 |
| 14 | 4131009 |
| 15 | 14567657 |
| 16 | 53697270 |
| 17 | 191684283 |
| 18 | 700312381 |
| 19 | 2515972324 |
| 20 | 9149426897 |
| 21 | 32981059485 |
| 22 | 119645675898 |
| 23 | 432046756571 |
| 24 | 1565346866889 |
| 25 | 5657752486512 |
| 26 | 20484930829825 |
[0,1,1,14,27,165,428,2001,6069,25042,82555,319793, 1101816,4131009,14567657,53697270,191684283, 700312381,2515972324,9149426897,32981059485, 119645675898,432046756571,1565346866889, 5657752486512,20484930829825] |