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A027789 as a simple table
| n | a(n) |
|---|---|
| 1 | 4 |
| 2 | 30 |
| 3 | 120 |
| 4 | 350 |
| 5 | 840 |
| 6 | 1764 |
| 7 | 3360 |
| 8 | 5940 |
| 9 | 9900 |
| 10 | 15730 |
| 11 | 24024 |
| 12 | 35490 |
| 13 | 50960 |
| 14 | 71400 |
| 15 | 97920 |
| 16 | 131784 |
| 17 | 174420 |
| 18 | 227430 |
| 19 | 292600 |
| 20 | 371910 |
| 21 | 467544 |
| 22 | 581900 |
| 23 | 717600 |
| 24 | 877500 |
| 25 | 1064700 |
| 26 | 1282554 |
| 27 | 1534680 |
| 28 | 1824970 |
| 29 | 2157600 |
| 30 | 2537040 |
| 31 | 2968064 |
| 32 | 3455760 |
| 33 | 4005540 |
| 34 | 4623150 |
| 35 | 5314680 |
[4,30,120,350,840,1764,3360,5940,9900,15730,24024, 35490,50960,71400,97920,131784,174420,227430, 292600,371910,467544,581900,717600,877500,1064700, 1282554,1534680,1824970,2157600,2537040,2968064, 3455760,4005540,4623150,5314680] |