n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 21 |
4 | 87 |
5 | 320 |
6 | 1378 |
7 | 5734 |
8 | 24390 |
9 | 104847 |
10 | 468509 |
11 | 2014677 |
12 | 9086639 |
13 | 40512331 |
14 | 181514161 |
15 | 817438205 |
16 | 3739814457 |
17 | 16804267343 |
18 | 77203662737 |
19 | 352969349528 |
20 | 1615132230644 |
21 | 7418825839826 |
22 | 34348050827280 |
23 | 157446234193077 |
24 | 730722286101755 |
25 | 3383822047970392 |
26 | 15662986091827772 |
27 | 72724675112435270 |
[1,2,6,21,87,320,1378,5734,24390,104847,468509, 2014677,9086639,40512331,181514161,817438205, 3739814457,16804267343,77203662737,352969349528, 1615132230644,7418825839826,34348050827280, 157446234193077,730722286101755,3383822047970392, 15662986091827772,72724675112435270] |