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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 6 |
| 2 | 780 |
| 3 | 6930 |
| 4 | 30744 |
| 5 | 96030 |
| 6 | 241956 |
| 7 | 526890 |
| 8 | 1032240 |
| 9 | 1866294 |
| 10 | 3168060 |
| 11 | 5111106 |
| 12 | 7907400 |
| 13 | 11811150 |
| 14 | 17122644 |
| 15 | 24192090 |
| 16 | 33423456 |
| 17 | 45278310 |
| 18 | 60279660 |
| 19 | 79015794 |
| 20 | 102144120 |
| 21 | 130395006 |
| 22 | 164575620 |
| 23 | 205573770 |
| 24 | 254361744 |
| 25 | 312000150 |
| 26 | 379641756 |
| 27 | 458535330 |
| 28 | 550029480 |
| 29 | 655576494 |
[0,6,780,6930,30744,96030,241956,526890,1032240, 1866294,3168060,5111106,7907400,11811150,17122644, 24192090,33423456,45278310,60279660,79015794, 102144120,130395006,164575620,205573770,254361744, 312000150,379641756,458535330,550029480,655576494] |