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| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 5 |
| 5 | 19 |
| 6 | 72 |
| 7 | 268 |
| 8 | 1005 |
| 9 | 3799 |
| 10 | 14350 |
| 11 | 54444 |
| 12 | 207135 |
| 13 | 790949 |
| 14 | 3031433 |
| 15 | 11646994 |
| 16 | 44857634 |
| 17 | 173127114 |
| 18 | 669509099 |
| 19 | 2594004566 |
| 20 | 10066946714 |
| 21 | 39126828963 |
| 22 | 152278248462 |
| 23 | 593391659312 |
| 24 | 2314989154878 |
| 25 | 9041050018706 |
[1,5,19,72,268,1005,3799,14350,54444,207135, 790949,3031433,11646994,44857634,173127114, 669509099,2594004566,10066946714,39126828963, 152278248462,593391659312,2314989154878, 9041050018706] |