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| n | a(n) |
|---|---|
| 1 | 3 |
| 2 | 8 |
| 3 | 26 |
| 4 | 81 |
| 5 | 261 |
| 6 | 936 |
| 7 | 3435 |
| 8 | 12406 |
| 9 | 45637 |
| 10 | 165303 |
| 11 | 579197 |
| 12 | 2056418 |
| 13 | 7724487 |
| 14 | 30188921 |
| 15 | 117283664 |
| 16 | 443965914 |
| 17 | 1645885655 |
| 18 | 6011641972 |
| 19 | 21768376301 |
| 20 | 79175516820 |
| 21 | 293501032240 |
| 22 | 1120198277690 |
| 23 | 4414668160947 |
| 24 | 17781778665225 |
[3,8,26,81,261,936,3435,12406,45637,165303,579197, 2056418,7724487,30188921,117283664,443965914, 1645885655,6011641972,21768376301,79175516820, 293501032240,1120198277690,4414668160947, 17781778665225] |