| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 1 |
| 3 | 3 |
| 4 | 8 |
| 5 | 15 |
| 6 | 31 |
| 7 | 51 |
| 8 | 90 |
| 9 | 142 |
| 10 | 228 |
| 11 | 341 |
| 12 | 525 |
| 13 | 757 |
| 14 | 1110 |
| 15 | 1572 |
| 16 | 2233 |
| 17 | 3084 |
| 18 | 4286 |
| 19 | 5812 |
| 20 | 7910 |
| 21 | 10580 |
| 22 | 14145 |
| 23 | 18659 |
| 24 | 24626 |
| 25 | 32099 |
| 26 | 41814 |
| 27 | 53976 |
| 28 | 69559 |
| 29 | 88932 |
| 30 | 113557 |
| 31 | 143967 |
| 32 | 182241 |
| 33 | 229353 |
| 34 | 288078 |
| 35 | 360029 |
| 36 | 449158 |
| 37 | 557757 |
| 38 | 691369 |
| 39 | 853628 |
| 40 | 1051974 |
[0,1,3,8,15,31,51,90,142,228,341,525,757,1110, 1572,2233,3084,4286,5812,7910,10580,14145,18659, 24626,32099,41814,53976,69559,88932,113557,143967, 182241,229353,288078,360029,449158,557757,691369, 853628,1051974] |