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| n | a(n) |
|---|---|
| 0 | 1 |
| 1 | 23 |
| 2 | 276 |
| 3 | 2323 |
| 4 | 15479 |
| 5 | 87101 |
| 6 | 430445 |
| 7 | 1917349 |
| 8 | 7839849 |
| 9 | 29824583 |
| 10 | 106646308 |
| 11 | 361327079 |
| 12 | 1167406906 |
| 13 | 3615602714 |
| 14 | 10780913004 |
| 15 | 31061653709 |
| 16 | 86741652761 |
| 17 | 235404301651 |
| 18 | 622271232287 |
| 19 | 1605432041576 |
| 20 | 4049617772390 |
| 21 | 10002785010369 |
| 22 | 24227747380447 |
| 23 | 57613905606273 |
| 24 | 134662398395411 |
[1,23,276,2323,15479,87101,430445,1917349,7839849, 29824583,106646308,361327079,1167406906, 3615602714,10780913004,31061653709,86741652761, 235404301651,622271232287,1605432041576, 4049617772390,10002785010369,24227747380447, 57613905606273,134662398395411] |