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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 2 |
| 3 | 4 |
| 4 | 11 |
| 5 | 29 |
| 6 | 91 |
| 7 | 284 |
| 8 | 950 |
| 9 | 3235 |
| 10 | 11336 |
| 11 | 40370 |
| 12 | 146095 |
| 13 | 534774 |
| 14 | 1977891 |
| 15 | 7377235 |
| 16 | 27719883 |
[1,2,4,11,29,91,284,950,3235,11336,40370,146095, 534774,1977891,7377235,27719883] |