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| n | a(n) |
|---|---|
| 1 | 24 |
| 2 | 174 |
| 3 | 1086 |
| 4 | 6300 |
| 5 | 34890 |
| 6 | 187224 |
| 7 | 982086 |
| 8 | 5063964 |
| 9 | 25764066 |
| 10 | 129678528 |
| 11 | 646978302 |
| 12 | 3204131172 |
| 13 | 15769455258 |
| 14 | 77195600520 |
| 15 | 376136512950 |
| 16 | 1825265294892 |
| 17 | 8825528262738 |
| 18 | 42536536932432 |
| 19 | 204425809550958 |
| 20 | 979908028544244 |
[24,174,1086,6300,34890,187224,982086,5063964, 25764066,129678528,646978302,3204131172, 15769455258,77195600520,376136512950, 1825265294892,8825528262738,42536536932432, 204425809550958,979908028544244] |