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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 6 |
| 2 | 21 |
| 3 | 62 |
| 4 | 162 |
| 5 | 384 |
| 6 | 855 |
| 7 | 1806 |
| 8 | 3648 |
| 9 | 7110 |
| 10 | 13434 |
| 11 | 24702 |
| 12 | 44361 |
| 13 | 78006 |
| 14 | 134592 |
| 15 | 228302 |
| 16 | 381300 |
| 17 | 627840 |
| 18 | 1020394 |
| 19 | 1638528 |
| 20 | 2601849 |
| 21 | 4088780 |
| 22 | 6363354 |
| 23 | 9813504 |
| 24 | 15005458 |
| 25 | 22760262 |
| 26 | 34261248 |
| 27 | 51204222 |
| 28 | 76005906 |
| 29 | 112092438 |
| 30 | 164296989 |
| 31 | 239404860 |
| 32 | 346898496 |
| 33 | 499971968 |
| 34 | 716906394 |
[1,6,21,62,162,384,855,1806,3648,7110,13434,24702, 44361,78006,134592,228302,381300,627840,1020394, 1638528,2601849,4088780,6363354,9813504,15005458, 22760262,34261248,51204222,76005906,112092438, 164296989,239404860,346898496,499971968,716906394] |