n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 36 |
6 | 117 |
7 | 411 |
8 | 1452 |
9 | 5040 |
10 | 17829 |
11 | 62870 |
12 | 222458 |
13 | 789895 |
14 | 2808018 |
15 | 10006020 |
16 | 35713288 |
17 | 127657287 |
18 | 456975112 |
19 | 1637845137 |
20 | 5876993799 |
21 | 21110257429 |
22 | 75900966585 |
23 | 273140226328 |
24 | 983733709424 |
25 | 3545658087397 |
26 | 12788512426396 |
27 | 46155740640489 |
28 | 166684398100813 |
29 | 602296651467057 |
30 | 2177492178467267 |
31 | 7876245417001355 |
[0,1,3,9,36,117,411,1452,5040,17829,62870,222458, 789895,2808018,10006020,35713288,127657287, 456975112,1637845137,5876993799,21110257429, 75900966585,273140226328,983733709424, 3545658087397,12788512426396,46155740640489, 166684398100813,602296651467057,2177492178467267, 7876245417001355] |