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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 15 |
| 2 | 953 |
| 3 | 12435 |
| 4 | 88273 |
| 5 | 394691 |
| 6 | 1405325 |
| 7 | 4031123 |
| 8 | 10248133 |
| 9 | 23120727 |
| 10 | 48218513 |
| 11 | 93417543 |
| 12 | 172039681 |
| 13 | 299505299 |
| 14 | 503363697 |
| 15 | 813950491 |
| 16 | 1279144845 |
| 17 | 1950568311 |
| 18 | 2912136485 |
| 19 | 4244109647 |
| 20 | 6080556217 |
| 21 | 8545686087 |
| 22 | 11835454865 |
[1,15,953,12435,88273,394691,1405325,4031123, 10248133,23120727,48218513,93417543,172039681, 299505299,503363697,813950491,1279144845, 1950568311,2912136485,4244109647,6080556217, 8545686087,11835454865] |