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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 3 |
| 2 | 10 |
| 3 | 35 |
| 4 | 127 |
| 5 | 474 |
| 6 | 1807 |
| 7 | 6999 |
| 8 | 27436 |
| 9 | 108541 |
| 10 | 432493 |
| 11 | 1733174 |
| 12 | 6977777 |
| 13 | 28200413 |
| 14 | 114338320 |
| 15 | 464857475 |
| 16 | 1894420045 |
| 17 | 7736238420 |
| 18 | 31649963275 |
| 19 | 129693294945 |
| 20 | 532216500532 |
| 21 | 2186868151211 |
| 22 | 8996351889535 |
| 23 | 37048736568870 |
| 24 | 152722557174139 |
| 25 | 630116066189691 |
[1,3,10,35,127,474,1807,6999,27436,108541,432493, 1733174,6977777,28200413,114338320,464857475, 1894420045,7736238420,31649963275,129693294945, 532216500532,2186868151211,8996351889535, 37048736568870,152722557174139,630116066189691] |