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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 8 |
| 2 | 37 |
| 3 | 149 |
| 4 | 660 |
| 5 | 2828 |
| 6 | 11640 |
| 7 | 47772 |
| 8 | 195228 |
| 9 | 799548 |
| 10 | 3210132 |
| 11 | 12798092 |
| 12 | 51356972 |
| 13 | 206336420 |
| 14 | 827722568 |
| 15 | 3316202936 |
[1,8,37,149,660,2828,11640,47772,195228,799548, 3210132,12798092,51356972,206336420,827722568, 3316202936] |