| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 4 |
| 5 | 7 |
| 6 | 12 |
| 7 | 20 |
| 8 | 31 |
| 9 | 47 |
| 10 | 70 |
| 11 | 99 |
| 12 | 137 |
| 13 | 184 |
| 14 | 239 |
| 15 | 300 |
| 16 | 369 |
| 17 | 432 |
| 18 | 498 |
| 19 | 551 |
| 20 | 594 |
| 21 | 614 |
| 22 | 624 |
| 23 | 601 |
| 24 | 570 |
| 25 | 514 |
| 26 | 453 |
| 27 | 378 |
| 28 | 312 |
| 29 | 238 |
| 30 | 181 |
| 31 | 128 |
| 32 | 89 |
| 33 | 56 |
| 34 | 37 |
| 35 | 20 |
| 36 | 12 |
| 37 | 6 |
| 38 | 3 |
| 39 | 1 |
| 40 | 1 |
[1,1,1,2,4,7,12,20,31,47,70,99,137,184,239,300, 369,432,498,551,594,614,624,601,570,514,453,378, 312,238,181,128,89,56,37,20,12,6,3,1,1] |