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| n | a(n) |
|---|---|
| 1 | 6 |
| 2 | 42 |
| 3 | 120 |
| 4 | 156 |
| 5 | 420 |
| 6 | 630 |
| 7 | 930 |
| 8 | 1428 |
| 9 | 1806 |
| 10 | 2016 |
| 11 | 2184 |
| 12 | 3192 |
| 13 | 4950 |
| 14 | 5256 |
| 15 | 8190 |
| 16 | 8364 |
| 17 | 8970 |
| 18 | 10296 |
| 19 | 10998 |
| 20 | 12210 |
| 21 | 17556 |
| 22 | 19110 |
| 23 | 21114 |
| 24 | 23994 |
| 25 | 24492 |
| 26 | 28050 |
| 27 | 32640 |
| 28 | 33306 |
| 29 | 34362 |
| 30 | 37506 |
| 31 | 39270 |
| 32 | 44310 |
| 33 | 52326 |
| 34 | 57684 |
| 35 | 57840 |
| 36 | 70686 |
| 37 | 74256 |
| 38 | 79800 |
| 39 | 83076 |
[6,42,120,156,420,630,930,1428,1806,2016,2184, 3192,4950,5256,8190,8364,8970,10296,10998,12210, 17556,19110,21114,23994,24492,28050,32640,33306, 34362,37506,39270,44310,52326,57684,57840,70686, 74256,79800,83076] |