n | a(n) |
---|---|
1 | 15 |
2 | 180 |
3 | 3900 |
4 | 29400 |
5 | 442860 |
6 | 1206660 |
7 | 6034320 |
8 | 11761380 |
9 | 37008840 |
10 | 148705620 |
11 | 221875680 |
12 | 641431260 |
13 | 1187525640 |
14 | 1580340300 |
15 | 2694803280 |
16 | 5541089580 |
17 | 10545132540 |
18 | 12880092660 |
19 | 22614594420 |
20 | 32025069720 |
21 | 37833555240 |
[15,180,3900,29400,442860,1206660,6034320, 11761380,37008840,148705620,221875680,641431260, 1187525640,1580340300,2694803280,5541089580, 10545132540,12880092660,22614594420,32025069720, 37833555240] |