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| n | a(n) |
|---|---|
| -1 | 1 |
| 0 | 6 |
| 1 | 17 |
| 2 | 46 |
| 3 | 116 |
| 4 | 252 |
| 5 | 533 |
| 6 | 1034 |
| 7 | 1961 |
| 8 | 3540 |
| 9 | 6253 |
| 10 | 10654 |
| 11 | 17897 |
| 12 | 29284 |
| 13 | 47265 |
| 14 | 74868 |
| 15 | 117158 |
| 16 | 180608 |
| 17 | 275562 |
| 18 | 415300 |
| 19 | 620210 |
| 20 | 916860 |
| 21 | 1344251 |
| 22 | 1953974 |
| 23 | 2819664 |
| 24 | 4038300 |
| 25 | 5746031 |
| 26 | 8122072 |
| 27 | 11413112 |
| 28 | 15943576 |
| 29 | 22153909 |
| 30 | 30620666 |
[1,6,17,46,116,252,533,1034,1961,3540,6253,10654, 17897,29284,47265,74868,117158,180608,275562, 415300,620210,916860,1344251,1953974,2819664, 4038300,5746031,8122072,11413112,15943576, 22153909,30620666] |