n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 2 |
3 | 4 |
4 | 16 |
5 | 64 |
6 | 266 |
7 | 1210 |
8 | 5630 |
9 | 27338 |
10 | 136182 |
11 | 695270 |
12 | 3622134 |
13 | 19202912 |
14 | 103375978 |
15 | 564014502 |
16 | 3114100008 |
17 | 17377324802 |
18 | 97897946434 |
19 | 556290574936 |
20 | 3185821992528 |
21 | 18375238184570 |
22 | 106677854854822 |
23 | 623039452424644 |
24 | 3658928077976048 |
25 | 21597785683494184 |
26 | 128091748188993146 |
27 | 763037745974345554 |
[1,0,2,4,16,64,266,1210,5630,27338,136182,695270, 3622134,19202912,103375978,564014502,3114100008, 17377324802,97897946434,556290574936, 3185821992528,18375238184570,106677854854822, 623039452424644,3658928077976048, 21597785683494184,128091748188993146, 763037745974345554] |