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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 37 |
| 3 | 495 |
| 4 | 7761 |
| 5 | 131283 |
| 6 | 2336629 |
| 7 | 43174911 |
| 8 | 819869185 |
| 9 | 15906350403 |
| 10 | 313905320037 |
| 11 | 6281740700271 |
| 12 | 127173173346129 |
| 13 | 2599950664710675 |
| 14 | 53601450936173877 |
| 15 | 1113117091905581055 |
| 16 | 23262762639358582785 |
| 17 | 488890438209132473475 |
| 18 | 10325711607889973605285 |
| 19 | 219057502101780979753455 |
[1,3,37,495,7761,131283,2336629,43174911, 819869185,15906350403,313905320037,6281740700271, 127173173346129,2599950664710675, 53601450936173877,1113117091905581055, 23262762639358582785,488890438209132473475, 10325711607889973605285,219057502101780979753455] |