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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 33 |
| 2 | 276 |
| 3 | 1299 |
| 4 | 4392 |
| 5 | 11925 |
| 6 | 27708 |
| 7 | 57351 |
| 8 | 108624 |
| 9 | 191817 |
| 10 | 320100 |
| 11 | 509883 |
| 12 | 781176 |
| 13 | 1157949 |
| 14 | 1668492 |
| 15 | 2345775 |
| 16 | 3227808 |
| 17 | 4358001 |
| 18 | 5785524 |
| 19 | 7565667 |
| 20 | 9760200 |
| 21 | 12437733 |
| 22 | 15674076 |
| 23 | 19552599 |
| 24 | 24164592 |
| 25 | 29609625 |
| 26 | 35995908 |
[1,33,276,1299,4392,11925,27708,57351,108624, 191817,320100,509883,781176,1157949,1668492, 2345775,3227808,4358001,5785524,7565667,9760200, 12437733,15674076,19552599,24164592,29609625, 35995908] |