n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 6 |
3 | 6 |
4 | 30 |
5 | 60 |
6 | 170 |
7 | 420 |
8 | 1050 |
9 | 2660 |
10 | 6552 |
11 | 16380 |
12 | 40362 |
13 | 99792 |
14 | 245520 |
15 | 603372 |
16 | 1480050 |
17 | 3624192 |
18 | 8863712 |
19 | 21647340 |
20 | 52811616 |
21 | 128700000 |
22 | 313341756 |
23 | 762206016 |
24 | 1852565650 |
25 | 4499346072 |
26 | 10919990460 |
27 | 26485897932 |
28 | 64201490352 |
29 | 155536089240 |
30 | 376606931436 |
[1,0,6,6,30,60,170,420,1050,2660,6552,16380,40362, 99792,245520,603372,1480050,3624192,8863712, 21647340,52811616,128700000,313341756,762206016, 1852565650,4499346072,10919990460,26485897932, 64201490352,155536089240,376606931436] |