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| n | a(n) |
|---|---|
| 5 | 1 |
| 6 | 10 |
| 7 | 88 |
| 8 | 730 |
| 9 | 6118 |
| 10 | 50056 |
| 11 | 413170 |
| 12 | 3442930 |
| 13 | 29255424 |
| 14 | 253838072 |
| 15 | 2253901296 |
| 16 | 20463487776 |
| 17 | 189807311174 |
| 18 | 1796551402964 |
| 19 | 17341237885160 |
| 20 | 170630252165826 |
| 21 | 1711128376836476 |
| 22 | 17486837759278710 |
| 23 | 182094398861966064 |
| 24 | 1931781562533747898 |
| 25 | 20872575572271906478 |
[1,10,88,730,6118,50056,413170,3442930,29255424, 253838072,2253901296,20463487776,189807311174, 1796551402964,17341237885160,170630252165826, 1711128376836476,17486837759278710, 182094398861966064,1931781562533747898, 20872575572271906478] |