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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 7 |
| 3 | 21 |
| 4 | 88 |
| 5 | 307 |
| 6 | 1373 |
| 7 | 5156 |
| 8 | 23757 |
| 9 | 93219 |
| 10 | 436802 |
| 11 | 1764928 |
| 12 | 8361824 |
| 13 | 34513404 |
| 14 | 164810322 |
| 15 | 691394058 |
| 16 | 3321137711 |
| 17 | 14112642022 |
| 18 | 68100605945 |
| 19 | 292419142044 |
| 20 | 1416190849181 |
| 21 | 6133951316583 |
| 22 | 29794512601288 |
| 23 | 129997620164309 |
| 24 | 632986280624799 |
| 25 | 2779206446859016 |
| 26 | 13560545542449322 |
| 27 | 59864741413738210 |
[1,2,7,21,88,307,1373,5156,23757,93219,436802, 1764928,8361824,34513404,164810322,691394058, 3321137711,14112642022,68100605945,292419142044, 1416190849181,6133951316583,29794512601288, 129997620164309,632986280624799,2779206446859016, 13560545542449322,59864741413738210] |