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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 5 |
| 2 | 19 |
| 3 | 61 |
| 4 | 179 |
| 5 | 493 |
| 6 | 1299 |
| 7 | 3309 |
| 8 | 8211 |
| 9 | 19949 |
| 10 | 47635 |
| 11 | 112109 |
| 12 | 260627 |
| 13 | 599533 |
| 14 | 1366547 |
| 15 | 3089901 |
| 16 | 6937107 |
| 17 | 15476205 |
| 18 | 34331155 |
| 19 | 75769325 |
| 20 | 166451731 |
| 21 | 364127725 |
| 22 | 793500179 |
| 23 | 1723082221 |
| 24 | 3729512979 |
| 25 | 8048092653 |
| 26 | 17319057939 |
[1,5,19,61,179,493,1299,3309,8211,19949,47635, 112109,260627,599533,1366547,3089901,6937107, 15476205,34331155,75769325,166451731,364127725, 793500179,1723082221,3729512979,8048092653, 17319057939] |