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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 17 |
| 3 | 95 |
| 4 | 577 |
| 5 | 3591 |
| 6 | 22913 |
| 7 | 148423 |
| 8 | 973297 |
| 9 | 6440919 |
| 10 | 42938417 |
| 11 | 287943719 |
| 12 | 1940382241 |
| 13 | 13129012247 |
| 14 | 89139404337 |
| 15 | 606990586023 |
| 16 | 4143744218529 |
| 17 | 28350360516935 |
| 18 | 194338902989281 |
| 19 | 1334433092793687 |
| 20 | 9176683714637953 |
| 21 | 63190999089974583 |
| 22 | 435656341477960785 |
| 23 | 3006765235738762775 |
[1,3,17,95,577,3591,22913,148423,973297,6440919, 42938417,287943719,1940382241,13129012247, 89139404337,606990586023,4143744218529, 28350360516935,194338902989281,1334433092793687, 9176683714637953,63190999089974583, 435656341477960785,3006765235738762775] |