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| n | a(n) |
|---|---|
| 1 | 36 |
| 2 | 186 |
| 3 | 944 |
| 4 | 4764 |
| 5 | 23824 |
| 6 | 118360 |
| 7 | 584192 |
| 8 | 2867280 |
| 9 | 14000960 |
| 10 | 68054336 |
| 11 | 329428048 |
| 12 | 1588714080 |
| 13 | 7636061184 |
| 14 | 36590420768 |
| 15 | 174849450144 |
| 16 | 833428507648 |
| 17 | 3963494947280 |
| 18 | 18809675141312 |
| 19 | 89095618484832 |
| 20 | 421283134048224 |
[36,186,944,4764,23824,118360,584192,2867280, 14000960,68054336,329428048,1588714080,7636061184, 36590420768,174849450144,833428507648, 3963494947280,18809675141312,89095618484832, 421283134048224] |