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| n | a(n) |
|---|---|
| 0 | 25 |
| 1 | 51 |
| 2 | 280 |
| 3 | 1731 |
| 4 | 8935 |
| 5 | 19601 |
| 6 | 988985 |
| 7 | 1997571 |
| 8 | 10976840 |
| 9 | 67858611 |
| 10 | 350269895 |
| 11 | 768398401 |
| 12 | 38770189945 |
| 13 | 78308778291 |
| 14 | 430314081400 |
| 15 | 2660193266691 |
| 16 | 13731280414855 |
| 17 | 30122754096401 |
| 18 | 1519868985234905 |
[25,51,280,1731,8935,19601,988985,1997571, 10976840,67858611,350269895,768398401,38770189945, 78308778291,430314081400,2660193266691, 13731280414855,30122754096401,1519868985234905] |