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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1 |
| 2 | 16 |
| 3 | 225 |
| 4 | 3136 |
| 5 | 43681 |
| 6 | 608400 |
| 7 | 8473921 |
| 8 | 118026496 |
| 9 | 1643897025 |
| 10 | 22896531856 |
| 11 | 318907548961 |
| 12 | 4441809153600 |
| 13 | 61866420601441 |
| 14 | 861688079266576 |
| 15 | 12001766689130625 |
| 16 | 167163045568562176 |
| 17 | 2328280871270739841 |
| 18 | 32428769152221795600 |
| 19 | 451674487259834398561 |
[0,1,16,225,3136,43681,608400,8473921,118026496, 1643897025,22896531856,318907548961,4441809153600, 61866420601441,861688079266576,12001766689130625, 167163045568562176,2328280871270739841, 32428769152221795600,451674487259834398561] |