The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 3 |
| 2 | 26 |
| 3 | 111 |
| 4 | 324 |
| 5 | 755 |
| 6 | 1518 |
| 7 | 2751 |
| 8 | 4616 |
| 9 | 7299 |
| 10 | 11010 |
| 11 | 15983 |
| 12 | 22476 |
| 13 | 30771 |
| 14 | 41174 |
| 15 | 54015 |
| 16 | 69648 |
| 17 | 88451 |
| 18 | 110826 |
| 19 | 137199 |
| 20 | 168020 |
| 21 | 203763 |
| 22 | 244926 |
| 23 | 292031 |
| 24 | 345624 |
| 25 | 406275 |
| 26 | 474578 |
| 27 | 551151 |
| 28 | 636636 |
| 29 | 731699 |
| 30 | 837030 |
| 31 | 953343 |
| 32 | 1081376 |
| 33 | 1221891 |
[0,3,26,111,324,755,1518,2751,4616,7299,11010, 15983,22476,30771,41174,54015,69648,88451,110826, 137199,168020,203763,244926,292031,345624,406275, 474578,551151,636636,731699,837030,953343,1081376, 1221891] |