n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 22 |
6 | 90 |
7 | 393 |
8 | 1789 |
9 | 8378 |
10 | 40050 |
11 | 194492 |
12 | 956448 |
13 | 4752519 |
14 | 23822571 |
15 | 120315345 |
16 | 611644737 |
17 | 3127389106 |
18 | 16072642890 |
19 | 82981119252 |
20 | 430187414196 |
21 | 2238469102212 |
22 | 11687227631892 |
23 | 61208286479382 |
24 | 321465732705594 |
[1,1,2,6,22,90,393,1789,8378,40050,194492,956448, 4752519,23822571,120315345,611644737,3127389106, 16072642890,82981119252,430187414196, 2238469102212,11687227631892,61208286479382, 321465732705594] |