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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 5 |
| 3 | 15 |
| 4 | 41 |
| 5 | 107 |
| 6 | 276 |
| 7 | 708 |
| 8 | 1811 |
| 9 | 4629 |
| 10 | 11827 |
| 11 | 30214 |
| 12 | 77182 |
| 13 | 197159 |
| 14 | 503632 |
| 15 | 1286495 |
| 16 | 3286264 |
| 17 | 8394533 |
| 18 | 21443246 |
| 19 | 54775263 |
| 20 | 139919550 |
| 21 | 357414628 |
| 22 | 912990471 |
| 23 | 2332169791 |
| 24 | 5957363305 |
| 25 | 15217664544 |
| 26 | 38872451165 |
| 27 | 99296935817 |
[1,5,15,41,107,276,708,1811,4629,11827,30214, 77182,197159,503632,1286495,3286264,8394533, 21443246,54775263,139919550,357414628,912990471, 2332169791,5957363305,15217664544,38872451165, 99296935817] |