The OEIS is supported by the many generous donors to the OEIS Foundation.
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 3 |
| 2 | 15 |
| 3 | 48 |
| 4 | 120 |
| 5 | 255 |
| 6 | 483 |
| 7 | 840 |
| 8 | 1368 |
| 9 | 2115 |
| 10 | 3135 |
| 11 | 4488 |
| 12 | 6240 |
| 13 | 8463 |
| 14 | 11235 |
| 15 | 14640 |
| 16 | 18768 |
| 17 | 23715 |
| 18 | 29583 |
| 19 | 36480 |
| 20 | 44520 |
| 21 | 53823 |
| 22 | 64515 |
| 23 | 76728 |
| 24 | 90600 |
| 25 | 106275 |
| 26 | 123903 |
| 27 | 143640 |
| 28 | 165648 |
| 29 | 190095 |
| 30 | 217155 |
| 31 | 247008 |
| 32 | 279840 |
| 33 | 315843 |
| 34 | 355215 |
| 35 | 398160 |
| 36 | 444888 |
[0,3,15,48,120,255,483,840,1368,2115,3135,4488, 6240,8463,11235,14640,18768,23715,29583,36480, 44520,53823,64515,76728,90600,106275,123903, 143640,165648,190095,217155,247008,279840,315843, 355215,398160,444888] |