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| n | a(n) |
|---|---|
| 0 | 3 |
| 1 | 4 |
| 2 | 8 |
| 3 | 19 |
| 4 | 48 |
| 5 | 124 |
| 6 | 323 |
| 7 | 844 |
| 8 | 2208 |
| 9 | 5779 |
| 10 | 15128 |
| 11 | 39604 |
| 12 | 103683 |
| 13 | 271444 |
| 14 | 710648 |
| 15 | 1860499 |
| 16 | 4870848 |
| 17 | 12752044 |
| 18 | 33385283 |
| 19 | 87403804 |
| 20 | 228826128 |
| 21 | 599074579 |
| 22 | 1568397608 |
| 23 | 4106118244 |
| 24 | 10749957123 |
| 25 | 28143753124 |
[3,4,8,19,48,124,323,844,2208,5779,15128,39604, 103683,271444,710648,1860499,4870848,12752044, 33385283,87403804,228826128,599074579,1568397608, 4106118244,10749957123,28143753124] |