n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 6 |
3 | 26 |
4 | 136 |
5 | 812 |
6 | 5494 |
7 | 41414 |
8 | 341800 |
9 | 3056984 |
10 | 29415274 |
11 | 302501498 |
12 | 3305797444 |
13 | 38212967444 |
14 | 465409979038 |
15 | 5951991056558 |
16 | 79686155008816 |
17 | 1113909729606896 |
18 | 16219814971477330 |
19 | 245503998889083362 |
20 | 3855373914424695196 |
21 | 62708526467241370892 |
[1,2,6,26,136,812,5494,41414,341800,3056984, 29415274,302501498,3305797444,38212967444, 465409979038,5951991056558,79686155008816, 1113909729606896,16219814971477330, 245503998889083362,3855373914424695196, 62708526467241370892] |