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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 25 |
| 2 | 429 |
| 3 | 6305 |
| 4 | 85541 |
| 5 | 1108665 |
| 6 | 13976989 |
| 7 | 173186065 |
| 8 | 2122320981 |
| 9 | 25822510505 |
| 10 | 312717161549 |
| 11 | 3775431050625 |
| 12 | 45488017644421 |
| 13 | 547320192731545 |
| 14 | 6579560264282109 |
| 15 | 79048497300991985 |
| 16 | 949332313236647861 |
[1,25,429,6305,85541,1108665,13976989,173186065, 2122320981,25822510505,312717161549,3775431050625, 45488017644421,547320192731545,6579560264282109, 79048497300991985,949332313236647861] |