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| n | a(n) |
|---|---|
| 1 | 1600 |
| 2 | 10000 |
| 3 | 40000 |
| 4 | 160000 |
| 5 | 490000 |
| 6 | 1500625 |
| 7 | 3841600 |
| 8 | 9834496 |
| 9 | 22127616 |
| 10 | 49787136 |
| 11 | 101606400 |
| 12 | 207360000 |
| 13 | 392040000 |
| 14 | 741200625 |
| 15 | 1317690000 |
| 16 | 2342560000 |
| 17 | 3958926400 |
| 18 | 6690585616 |
| 19 | 10837642816 |
| 20 | 17555190016 |
| 21 | 27429984400 |
| 22 | 42859350625 |
[1600,10000,40000,160000,490000,1500625,3841600, 9834496,22127616,49787136,101606400,207360000, 392040000,741200625,1317690000,2342560000, 3958926400,6690585616,10837642816,17555190016, 27429984400,42859350625] |