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| n | a(n) |
|---|---|
| 0 | 4 |
| 1 | 10 |
| 2 | 24 |
| 3 | 59 |
| 4 | 162 |
| 5 | 526 |
| 6 | 2016 |
| 7 | 8978 |
| 8 | 45696 |
| 9 | 261760 |
| 10 | 1666308 |
| 11 | 11668652 |
| 12 | 89141580 |
| 13 | 737740174 |
| 14 | 6575238599 |
| 15 | 62788901290 |
| 16 | 639562492327 |
| 17 | 6921688171153 |
| 18 | 79316703841369 |
| 19 | 959397056891093 |
| 20 | 12215422719238138 |
| 21 | 163308172248420391 |
| 22 | 2287234651735371577 |
[4,10,24,59,162,526,2016,8978,45696,261760, 1666308,11668652,89141580,737740174,6575238599, 62788901290,639562492327,6921688171153, 79316703841369,959397056891093,12215422719238138, 163308172248420391,2287234651735371577] |