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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 3 |
| 3 | 5 |
| 4 | 16 |
| 5 | 36 |
| 6 | 124 |
| 7 | 287 |
| 8 | 1043 |
| 9 | 2573 |
| 10 | 9448 |
| 11 | 24161 |
| 12 | 89827 |
| 13 | 235902 |
| 14 | 886047 |
| 15 | 2372494 |
| 16 | 8968829 |
| 17 | 24410414 |
| 18 | 92783928 |
| 19 | 255723571 |
| 20 | 976331352 |
[1,3,5,16,36,124,287,1043,2573,9448,24161,89827, 235902,886047,2372494,8968829,24410414,92783928, 255723571,976331352] |