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A026018 as a simple table
| n | a(n) |
|---|---|
| 3 | 1 |
| 4 | 7 |
| 5 | 36 |
| 6 | 164 |
| 7 | 702 |
| 8 | 2898 |
| 9 | 11696 |
| 10 | 46512 |
| 11 | 183141 |
| 12 | 716243 |
| 13 | 2788060 |
| 14 | 10817820 |
| 15 | 41880930 |
| 16 | 161900910 |
| 17 | 625272480 |
| 18 | 2413491360 |
| 19 | 9313307370 |
| 20 | 35936613414 |
| 21 | 138680365704 |
| 22 | 535290282632 |
| 23 | 2066802226236 |
| 24 | 7983111461732 |
| 25 | 30848211650592 |
[1,7,36,164,702,2898,11696,46512,183141,716243, 2788060,10817820,41880930,161900910,625272480, 2413491360,9313307370,35936613414,138680365704, 535290282632,2066802226236,7983111461732, 30848211650592] |