n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 4 |
4 | 16 |
5 | 60 |
6 | 231 |
7 | 877 |
8 | 3362 |
9 | 12905 |
10 | 49825 |
11 | 193003 |
12 | 750581 |
13 | 2927792 |
14 | 11453171 |
15 | 44911853 |
16 | 176499605 |
17 | 694954416 |
18 | 2741031257 |
19 | 10827727980 |
20 | 42831355495 |
21 | 169640762209 |
22 | 672657218163 |
23 | 2669990735153 |
24 | 10608176066076 |
25 | 42184579054003 |
[0,1,4,16,60,231,877,3362,12905,49825,193003, 750581,2927792,11453171,44911853,176499605, 694954416,2741031257,10827727980,42831355495, 169640762209,672657218163,2669990735153, 10608176066076,42184579054003] |