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| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 6 |
| 2 | 30 |
| 3 | 84 |
| 4 | 180 |
| 5 | 330 |
| 6 | 546 |
| 7 | 840 |
| 8 | 1224 |
| 9 | 1710 |
| 10 | 2310 |
| 11 | 3036 |
| 12 | 3900 |
| 13 | 4914 |
| 14 | 6090 |
| 15 | 7440 |
| 16 | 8976 |
| 17 | 10710 |
| 18 | 12654 |
| 19 | 14820 |
| 20 | 17220 |
| 21 | 19866 |
| 22 | 22770 |
| 23 | 25944 |
| 24 | 29400 |
| 25 | 33150 |
| 26 | 37206 |
| 27 | 41580 |
| 28 | 46284 |
| 29 | 51330 |
| 30 | 56730 |
| 31 | 62496 |
| 32 | 68640 |
| 33 | 75174 |
| 34 | 82110 |
| 35 | 89460 |
| 36 | 97236 |
| 37 | 105450 |
[0,6,30,84,180,330,546,840,1224,1710,2310,3036, 3900,4914,6090,7440,8976,10710,12654,14820,17220, 19866,22770,25944,29400,33150,37206,41580,46284, 51330,56730,62496,68640,75174,82110,89460,97236, 105450] |