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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 36 |
| 3 | 122 |
| 4 | 354 |
| 5 | 948 |
| 6 | 2447 |
| 7 | 6210 |
| 8 | 15579 |
| 9 | 38644 |
| 10 | 94804 |
| 11 | 230340 |
| 12 | 555265 |
| 13 | 1330124 |
| 14 | 3169602 |
| 15 | 7518618 |
| 16 | 17762843 |
| 17 | 41813520 |
| 18 | 98111667 |
| 19 | 229548124 |
| 20 | 535677447 |
| 21 | 1247144584 |
| 22 | 2897380069 |
| 23 | 6718133382 |
| 24 | 15549483240 |
| 25 | 35930986632 |
| 26 | 82901588856 |
| 27 | 191005430706 |
| 28 | 439502265432 |
| 29 | 1010061841332 |
[1,8,36,122,354,948,2447,6210,15579,38644,94804, 230340,555265,1330124,3169602,7518618,17762843, 41813520,98111667,229548124,535677447,1247144584, 2897380069,6718133382,15549483240,35930986632, 82901588856,191005430706,439502265432, 1010061841332] |