n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 40 |
3 | 268 |
4 | 1796 |
5 | 12036 |
6 | 80660 |
7 | 540548 |
8 | 3622516 |
9 | 24276516 |
10 | 162690580 |
11 | 1090281028 |
12 | 7306586036 |
13 | 48965540196 |
14 | 328145609300 |
15 | 2199088184708 |
16 | 14737326074356 |
17 | 98763106151076 |
18 | 661867090908820 |
19 | 4435543424059588 |
20 | 29725069786599476 |
21 | 199204401658077156 |
[1,6,40,268,1796,12036,80660,540548,3622516, 24276516,162690580,1090281028,7306586036, 48965540196,328145609300,2199088184708, 14737326074356,98763106151076,661867090908820, 4435543424059588,29725069786599476, 199204401658077156] |