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| n | a(n) |
|---|---|
| 1 | 23 |
| 2 | 104 |
| 3 | 561 |
| 4 | 3071 |
| 5 | 21472 |
| 6 | 133646 |
| 7 | 919000 |
| 8 | 6530487 |
| 9 | 46899990 |
| 10 | 351910410 |
| 11 | 2629723769 |
| 12 | 20061701402 |
| 13 | 154031198836 |
| 14 | 1186422216734 |
| 15 | 9204115370568 |
| 16 | 71469834411742 |
| 17 | 556458026486814 |
| 18 | 4340103184723855 |
| 19 | 33868912292912126 |
[23,104,561,3071,21472,133646,919000,6530487, 46899990,351910410,2629723769,20061701402, 154031198836,1186422216734,9204115370568, 71469834411742,556458026486814,4340103184723855, 33868912292912126] |