n | a(n) |
---|---|
2 | 1 |
3 | 1 |
4 | 2 |
5 | 12 |
6 | 69 |
7 | 98 |
8 | 180 |
9 | 1056 |
10 | 3967 |
11 | 18357 |
12 | 77685 |
13 | 264563 |
14 | 1245762 |
15 | 1915056 |
16 | 5303208 |
17 | 24548040 |
18 | 107835695 |
19 | 375494210 |
20 | 1898502240 |
21 | 4942470942 |
22 | 23489565822 |
23 | 104559681798 |
24 | 413327570240 |
25 | 1426320927138 |
26 | 6025235528016 |
27 | 19911812844324 |
28 | 87316285518504 |
[1,1,2,12,69,98,180,1056,3967,18357,77685,264563, 1245762,1915056,5303208,24548040,107835695, 375494210,1898502240,4942470942,23489565822, 104559681798,413327570240,1426320927138, 6025235528016,19911812844324,87316285518504] |