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| n | a(n) |
|---|---|
| 1 | 31 |
| 2 | 311 |
| 3 | 2551 |
| 4 | 13711 |
| 5 | 53231 |
| 6 | 109751 |
| 7 | 425911 |
| 8 | 486671 |
| 9 | 975551 |
| 10 | 3180271 |
| 11 | 3407351 |
| 12 | 3893431 |
| 13 | 5955071 |
| 14 | 10485751 |
| 15 | 10984991 |
| 16 | 13719991 |
| 17 | 18261311 |
| 18 | 25442231 |
| 19 | 34294991 |
| 20 | 47640631 |
| 21 | 67406351 |
| 22 | 81935311 |
| 23 | 96244151 |
| 24 | 129671671 |
| 25 | 146090551 |
| 26 | 196519991 |
[31,311,2551,13711,53231,109751,425911,486671, 975551,3180271,3407351,3893431,5955071,10485751, 10984991,13719991,18261311,25442231,34294991, 47640631,67406351,81935311,96244151,129671671, 146090551,196519991] |