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| n | a(n) |
|---|---|
| 3 | 0 |
| 4 | 1 |
| 5 | 5 |
| 6 | 31 |
| 7 | 227 |
| 8 | 1909 |
| 9 | 18089 |
| 10 | 190435 |
| 11 | 2203319 |
| 12 | 27772873 |
| 13 | 378673901 |
| 14 | 5551390471 |
| 15 | 87057596075 |
| 16 | 1453986832381 |
| 17 | 25762467303377 |
| 18 | 482626240281739 |
| 19 | 9530573107600319 |
| 20 | 197850855756232465 |
| 21 | 4307357140602486869 |
| 22 | 98125321641110663023 |
| 23 | 2334414826276390013171 |
[0,1,5,31,227,1909,18089,190435,2203319,27772873, 378673901,5551390471,87057596075,1453986832381, 25762467303377,482626240281739,9530573107600319, 197850855756232465,4307357140602486869, 98125321641110663023,2334414826276390013171] |