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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 324 |
| 5 | 1444 |
| 6 | 26244 |
| 7 | 114244 |
| 8 | 116964 |
| 9 | 191844 |
| 10 | 213444 |
| 11 | 311364 |
| 12 | 412164 |
| 13 | 777924 |
| 14 | 2196324 |
| 15 | 3392964 |
| 16 | 6441444 |
| 17 | 11142244 |
| 18 | 13264164 |
| 19 | 16499844 |
| 20 | 21734244 |
| 21 | 23213124 |
| 22 | 23444964 |
| 23 | 24621444 |
| 24 | 26193924 |
| 25 | 27436644 |
| 26 | 36216324 |
| 27 | 44116164 |
| 28 | 47361924 |
| 29 | 61121124 |
| 30 | 61496964 |
| 31 | 63393444 |
[1,4,9,324,1444,26244,114244,116964,191844,213444, 311364,412164,777924,2196324,3392964,6441444, 11142244,13264164,16499844,21734244,23213124, 23444964,24621444,26193924,27436644,36216324, 44116164,47361924,61121124,61496964,63393444] |