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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 1681 |
| 2 | 23762 |
| 3 | 131043 |
| 4 | 465124 |
| 5 | 1275125 |
| 6 | 2948406 |
| 7 | 6041287 |
| 8 | 11309768 |
| 9 | 19740249 |
| 10 | 32580250 |
| 11 | 51369131 |
| 12 | 77968812 |
| 13 | 114594493 |
| 14 | 163845374 |
| 15 | 228735375 |
| 16 | 312723856 |
| 17 | 419746337 |
| 18 | 554245218 |
| 19 | 721200499 |
| 20 | 926160500 |
| 21 | 1175272581 |
| 22 | 1475313862 |
| 23 | 1833721943 |
| 24 | 2258625624 |
| 25 | 2758875625 |
| 26 | 3344075306 |
[0,1681,23762,131043,465124,1275125,2948406, 6041287,11309768,19740249,32580250,51369131, 77968812,114594493,163845374,228735375,312723856, 419746337,554245218,721200499,926160500, 1175272581,1475313862,1833721943,2258625624, 2758875625,3344075306] |