| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 15 |
| 3 | 66 |
| 4 | 190 |
| 5 | 435 |
| 6 | 861 |
| 7 | 1540 |
| 8 | 2556 |
| 9 | 4005 |
| 10 | 5995 |
| 11 | 8646 |
| 12 | 12090 |
| 13 | 16471 |
| 14 | 21945 |
| 15 | 28680 |
| 16 | 36856 |
| 17 | 46665 |
| 18 | 58311 |
| 19 | 72010 |
| 20 | 87990 |
| 21 | 106491 |
| 22 | 127765 |
| 23 | 152076 |
| 24 | 179700 |
| 25 | 210925 |
| 26 | 246051 |
| 27 | 285390 |
| 28 | 329266 |
| 29 | 378015 |
| 30 | 431985 |
| 31 | 491536 |
| 32 | 557040 |
| 33 | 628881 |
| 34 | 707455 |
| 35 | 793170 |
| 36 | 886446 |
| 37 | 987715 |
[0,1,15,66,190,435,861,1540,2556,4005,5995,8646, 12090,16471,21945,28680,36856,46665,58311,72010, 87990,106491,127765,152076,179700,210925,246051, 285390,329266,378015,431985,491536,557040,628881, 707455,793170,886446,987715] |