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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 2 |
| 2 | 8 |
| 3 | 26 |
| 4 | 94 |
| 5 | 326 |
| 6 | 1196 |
| 7 | 4358 |
| 8 | 16248 |
| 9 | 60854 |
| 10 | 230184 |
| 11 | 874878 |
| 12 | 3343614 |
| 13 | 12825418 |
| 14 | 49368388 |
| 15 | 190554410 |
| 16 | 737328366 |
| 17 | 2858974502 |
| 18 | 11106267880 |
| 19 | 43215101102 |
| 20 | 168398785002 |
| 21 | 657070401106 |
| 22 | 2566847255572 |
| 23 | 10038191414610 |
| 24 | 39295007540748 |
[1,2,8,26,94,326,1196,4358,16248,60854,230184, 874878,3343614,12825418,49368388,190554410, 737328366,2858974502,11106267880,43215101102, 168398785002,657070401106,2566847255572, 10038191414610,39295007540748] |