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A033487 as a simple table
| n | a(n) |
|---|---|
| 0 | 0 |
| 1 | 6 |
| 2 | 30 |
| 3 | 90 |
| 4 | 210 |
| 5 | 420 |
| 6 | 756 |
| 7 | 1260 |
| 8 | 1980 |
| 9 | 2970 |
| 10 | 4290 |
| 11 | 6006 |
| 12 | 8190 |
| 13 | 10920 |
| 14 | 14280 |
| 15 | 18360 |
| 16 | 23256 |
| 17 | 29070 |
| 18 | 35910 |
| 19 | 43890 |
| 20 | 53130 |
| 21 | 63756 |
| 22 | 75900 |
| 23 | 89700 |
| 24 | 105300 |
| 25 | 122850 |
| 26 | 142506 |
| 27 | 164430 |
| 28 | 188790 |
| 29 | 215760 |
| 30 | 245520 |
| 31 | 278256 |
| 32 | 314160 |
| 33 | 353430 |
| 34 | 396270 |
| 35 | 442890 |
| 36 | 493506 |
[0,6,30,90,210,420,756,1260,1980,2970,4290,6006, 8190,10920,14280,18360,23256,29070,35910,43890, 53130,63756,75900,89700,105300,122850,142506, 164430,188790,215760,245520,278256,314160,353430, 396270,442890,493506] |