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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 9 |
| 2 | 51 |
| 3 | 234 |
| 4 | 951 |
| 5 | 3573 |
| 6 | 12707 |
| 7 | 43398 |
| 8 | 143682 |
| 9 | 464148 |
| 10 | 1469778 |
| 11 | 4578102 |
| 12 | 14063653 |
| 13 | 42695127 |
| 14 | 128301453 |
| 15 | 382144446 |
| 16 | 1129360689 |
| 17 | 3314619171 |
| 18 | 9668400839 |
| 19 | 28045947996 |
| 20 | 80949547380 |
| 21 | 232589050920 |
| 22 | 665532883380 |
| 23 | 1897176603420 |
| 24 | 5389368930505 |
| 25 | 15260830474869 |
| 26 | 43085718922071 |
| 27 | 121310066722194 |
| 28 | 340684392838971 |
| 29 | 954497114903169 |
[1,9,51,234,951,3573,12707,43398,143682,464148, 1469778,4578102,14063653,42695127,128301453, 382144446,1129360689,3314619171,9668400839, 28045947996,80949547380,232589050920,665532883380, 1897176603420,5389368930505,15260830474869, 43085718922071,121310066722194,340684392838971, 954497114903169] |