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| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 10 |
| 3 | 29 |
| 4 | 97 |
| 5 | 366 |
| 6 | 1533 |
| 7 | 7020 |
| 8 | 34631 |
| 9 | 181391 |
| 10 | 995139 |
| 11 | 5651157 |
| 12 | 32902123 |
| 13 | 194971159 |
| 14 | 1169639664 |
| 15 | 7076433285 |
| 16 | 43062727014 |
| 17 | 263096669677 |
| 18 | 1611790269519 |
| 19 | 9892521309824 |
| 20 | 60793268309048 |
| 21 | 373921041602730 |
| 22 | 2301237378396793 |
[4,10,29,97,366,1533,7020,34631,181391,995139, 5651157,32902123,194971159,1169639664,7076433285, 43062727014,263096669677,1611790269519, 9892521309824,60793268309048,373921041602730, 2301237378396793] |