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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 1 |
| 3 | 2 |
| 4 | 6 |
| 5 | 26 |
| 6 | 80 |
| 7 | 152 |
| 8 | 348 |
| 9 | 628 |
| 10 | 1868 |
| 11 | 3870 |
| 12 | 7014 |
| 13 | 11788 |
| 14 | 15746 |
| 15 | 18388 |
| 16 | 19820 |
| 17 | 17218 |
| 18 | 14344 |
| 19 | 9844 |
| 20 | 6238 |
| 21 | 3430 |
| 22 | 1968 |
| 23 | 814 |
| 24 | 184 |
| 25 | 84 |
| 26 | 52 |
| 27 | 190 |
| 28 | 656 |
| 29 | 132 |
[1,1,2,6,26,80,152,348,628,1868,3870,7014,11788, 15746,18388,19820,17218,14344,9844,6238,3430,1968, 814,184,84,52,190,656,132] |