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| n | a(n) |
|---|---|
| 0 | 7 |
| 1 | 21 |
| 2 | 70 |
| 3 | 245 |
| 4 | 861 |
| 5 | 3010 |
| 6 | 10535 |
| 7 | 36876 |
| 8 | 129066 |
| 9 | 451731 |
| 10 | 1581055 |
| 11 | 5533696 |
| 12 | 19367936 |
| 13 | 67787776 |
| 14 | 237257216 |
| 15 | 830400256 |
| 16 | 2906400896 |
| 17 | 10172403136 |
| 18 | 35603410976 |
| 19 | 124611938416 |
| 20 | 436141784456 |
| 21 | 1526496245596 |
| 22 | 5342736859586 |
| 23 | 18699579008551 |
| 24 | 65448526529925 |
| 25 | 229069842854741 |
[7,21,70,245,861,3010,10535,36876,129066,451731, 1581055,5533696,19367936,67787776,237257216, 830400256,2906400896,10172403136,35603410976, 124611938416,436141784456,1526496245596, 5342736859586,18699579008551,65448526529925, 229069842854741] |