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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 9 |
| 2 | 13 |
| 3 | 48 |
| 4 | 61 |
| 5 | 170 |
| 6 | 1421 |
| 7 | 3012 |
| 8 | 4433 |
| 9 | 16311 |
| 10 | 20744 |
| 11 | 57799 |
| 12 | 483136 |
| 13 | 1024071 |
| 14 | 1507207 |
| 15 | 5545692 |
| 16 | 7052899 |
| 17 | 19651490 |
| 18 | 164264819 |
| 19 | 348181128 |
| 20 | 512445947 |
| 21 | 1885518969 |
| 22 | 2397964916 |
| 23 | 6681448801 |
| 24 | 55849555324 |
[4,9,13,48,61,170,1421,3012,4433,16311,20744, 57799,483136,1024071,1507207,5545692,7052899, 19651490,164264819,348181128,512445947,1885518969, 2397964916,6681448801,55849555324] |