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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 6 |
| 3 | 35 |
| 4 | 199 |
| 5 | 1117 |
| 6 | 6335 |
| 7 | 37222 |
| 8 | 230809 |
| 9 | 1515784 |
| 10 | 10423684 |
| 11 | 73758799 |
| 12 | 529151547 |
| 13 | 3815582934 |
| 14 | 27567473744 |
| 15 | 199625904531 |
| 16 | 1451286365478 |
| 17 | 10610026385893 |
| 18 | 78068267016226 |
| 19 | 578088243024187 |
| 20 | 4304808678569939 |
| 21 | 32204405165738517 |
| 22 | 241805832191132439 |
| 23 | 1820963567348143772 |
[1,6,35,199,1117,6335,37222,230809,1515784, 10423684,73758799,529151547,3815582934, 27567473744,199625904531,1451286365478, 10610026385893,78068267016226,578088243024187, 4304808678569939,32204405165738517, 241805832191132439,1820963567348143772] |