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| n | a(n) |
|---|---|
| 1 | 2 |
| 2 | 6 |
| 3 | 14 |
| 4 | 35 |
| 5 | 95 |
| 6 | 257 |
| 7 | 700 |
| 8 | 1907 |
| 9 | 5202 |
| 10 | 14190 |
| 11 | 38712 |
| 12 | 105614 |
| 13 | 288137 |
| 14 | 786105 |
| 15 | 2144674 |
| 16 | 5851173 |
| 17 | 15963362 |
| 18 | 43551783 |
| 19 | 118819435 |
| 20 | 324167181 |
| 21 | 884403808 |
| 22 | 2412860224 |
| 23 | 6582846451 |
| 24 | 17959543175 |
| 25 | 48997829987 |
| 26 | 133677528403 |
| 27 | 364703530888 |
[2,6,14,35,95,257,700,1907,5202,14190,38712, 105614,288137,786105,2144674,5851173,15963362, 43551783,118819435,324167181,884403808,2412860224, 6582846451,17959543175,48997829987,133677528403, 364703530888] |