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| n | a(n) |
|---|---|
| 1 | 1 |
| 2 | 4 |
| 3 | 9 |
| 4 | 49 |
| 5 | 144 |
| 6 | 441 |
| 7 | 1444 |
| 8 | 11449 |
| 9 | 44944 |
| 10 | 991494144 |
| 11 | 4914991449 |
| 12 | 149991994944 |
| 13 | 9141411499911441 |
| 14 | 199499144494999441 |
| 15 | 9914419419914449449 |
| 16 | 444411911999914911441 |
| 17 | 419994999149149944149149944191494441 |
[1,4,9,49,144,441,1444,11449,44944,991494144, 4914991449,149991994944,9141411499911441, 199499144494999441,9914419419914449449, 444411911999914911441, 419994999149149944149149944191494441] |