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| n | a(n) |
|---|---|
| 4 | 2 |
| 5 | 55 |
| 6 | 389 |
| 7 | 1563 |
| 8 | 4642 |
| 9 | 11407 |
| 10 | 24600 |
| 11 | 48204 |
| 12 | 87758 |
| 13 | 150707 |
| 14 | 246787 |
| 15 | 388445 |
| 16 | 591294 |
| 17 | 874603 |
| 18 | 1261822 |
| 19 | 1781142 |
| 20 | 2466090 |
| 21 | 3356159 |
| 22 | 4497473 |
| 23 | 5943487 |
| 24 | 7755722 |
| 25 | 10004535 |
| 26 | 12769924 |
| 27 | 16142368 |
| 28 | 20223702 |
| 29 | 25128027 |
| 30 | 30982655 |
| 31 | 37929089 |
| 32 | 46124038 |
| 33 | 55740467 |
[2,55,389,1563,4642,11407,24600,48204,87758, 150707,246787,388445,591294,874603,1261822, 1781142,2466090,3356159,4497473,5943487,7755722, 10004535,12769924,16142368,20223702,25128027, 30982655,37929089,46124038,55740467] |