n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 16 |
3 | 64 |
4 | 252 |
5 | 968 |
6 | 3616 |
7 | 13120 |
8 | 46432 |
9 | 160772 |
10 | 545856 |
11 | 1821056 |
12 | 5979520 |
13 | 19350552 |
14 | 61795968 |
15 | 194964672 |
16 | 608261628 |
17 | 1878140024 |
18 | 5743681784 |
19 | 17408223328 |
20 | 52320105080 |
21 | 156011658272 |
22 | 461763417056 |
23 | 1357182242560 |
24 | 3962591708576 |
25 | 11497241014652 |
[1,4,16,64,252,968,3616,13120,46432,160772,545856, 1821056,5979520,19350552,61795968,194964672, 608261628,1878140024,5743681784,17408223328, 52320105080,156011658272,461763417056, 1357182242560,3962591708576,11497241014652] |