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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 7 |
| 4 | 25 |
| 5 | 61 |
| 6 | 481 |
| 7 | 2731 |
| 8 | 10417 |
| 9 | 454105 |
| 10 | 4309921 |
| 11 | 23452111 |
| 12 | 592433161 |
| 13 | 6789801877 |
| 14 | 46254009985 |
| 15 | 893881991731 |
| 16 | 11548704851041 |
| 17 | 93501748795441 |
| 18 | 4828847934591937 |
| 19 | 83867376656907415 |
| 20 | 823025819684123641 |
| 21 | 33409213329178701421 |
| 22 | 640457721676922946721 |
[1,1,1,7,25,61,481,2731,10417,454105,4309921, 23452111,592433161,6789801877,46254009985, 893881991731,11548704851041,93501748795441, 4828847934591937,83867376656907415, 823025819684123641,33409213329178701421, 640457721676922946721] |