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Reminder: The OEIS is hiring a new managing editor, and the application deadline is January 26.
| n | a(n) |
|---|---|
| 1 | 0 |
| 2 | 0 |
| 3 | 0 |
| 4 | 1 |
| 5 | 9 |
| 6 | 16 |
| 7 | 64 |
| 8 | 441 |
| 9 | 3025 |
| 10 | 5184 |
| 11 | 20736 |
| 12 | 142129 |
| 13 | 974169 |
| 14 | 1669264 |
| 15 | 6677056 |
| 16 | 45765225 |
| 17 | 313679521 |
| 18 | 537497856 |
| 19 | 2149991424 |
| 20 | 14736260449 |
| 21 | 101003831721 |
| 22 | 173072640400 |
| 23 | 692290561600 |
| 24 | 4745030099481 |
| 25 | 32522920134769 |
| 26 | 55728852710976 |
| 27 | 222915410843904 |
[0,0,0,1,9,16,64,441,3025,5184,20736,142129, 974169,1669264,6677056,45765225,313679521, 537497856,2149991424,14736260449,101003831721, 173072640400,692290561600,4745030099481, 32522920134769,55728852710976,222915410843904] |