n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 1 |
3 | 1 |
4 | 4 |
5 | 16 |
6 | 46 |
7 | 106 |
8 | 316 |
9 | 3564 |
10 | 27756 |
11 | 141516 |
12 | 556656 |
13 | 6678816 |
14 | 73015944 |
15 | 521124696 |
16 | 6144018336 |
17 | 75200767776 |
18 | 677927254176 |
19 | 4642387894944 |
20 | 75217104395136 |
21 | 1167068528384256 |
22 | 12348761954020416 |
23 | 97377968145352896 |
24 | 882819252604721664 |
25 | 66882151986021043200 |
[1,1,1,1,4,16,46,106,316,3564,27756,141516,556656, 6678816,73015944,521124696,6144018336,75200767776, 677927254176,4642387894944,75217104395136, 1167068528384256,12348761954020416, 97377968145352896,882819252604721664, 66882151986021043200] |