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| n | a(n) |
|---|---|
| 2 | 2 |
| 3 | 25 |
| 4 | 174 |
| 5 | 962 |
| 6 | 4804 |
| 7 | 22689 |
| 8 | 103510 |
| 9 | 461318 |
| 10 | 2021916 |
| 11 | 8752042 |
| 12 | 37520972 |
| 13 | 159633060 |
| 14 | 674969224 |
| 15 | 2839400945 |
| 16 | 11893509990 |
| 17 | 49637986590 |
| 18 | 206519808300 |
| 19 | 856904298030 |
| 20 | 3547095101220 |
| 21 | 14652264350940 |
| 22 | 60412895258040 |
| 23 | 248675669866650 |
| 24 | 1022088942267900 |
| 25 | 4195255959533052 |
[2,25,174,962,4804,22689,103510,461318,2021916, 8752042,37520972,159633060,674969224,2839400945, 11893509990,49637986590,206519808300,856904298030, 3547095101220,14652264350940,60412895258040, 248675669866650,1022088942267900,4195255959533052] |