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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 4 |
| 2 | 10 |
| 3 | 20 |
| 4 | 35 |
| 5 | 56 |
| 6 | 84 |
| 7 | 121 |
| 8 | 173 |
| 9 | 256 |
| 10 | 406 |
| 11 | 694 |
| 12 | 1247 |
| 13 | 2276 |
| 14 | 4113 |
| 15 | 7263 |
| 16 | 12487 |
| 17 | 20952 |
| 18 | 34519 |
| 19 | 56296 |
| 20 | 91667 |
| 21 | 150129 |
| 22 | 248442 |
| 23 | 415853 |
| 24 | 702561 |
| 25 | 1193284 |
| 26 | 2029036 |
| 27 | 3442498 |
| 28 | 5816480 |
| 29 | 9782234 |
| 30 | 16386865 |
| 31 | 27380039 |
| 32 | 45704706 |
| 33 | 76332852 |
| 34 | 127678961 |
| 35 | 213973997 |
[1,4,10,20,35,56,84,121,173,256,406,694,1247,2276, 4113,7263,12487,20952,34519,56296,91667,150129, 248442,415853,702561,1193284,2029036,3442498, 5816480,9782234,16386865,27380039,45704706, 76332852,127678961,213973997] |