n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 7 |
3 | 21 |
4 | 78 |
5 | 390 |
6 | 2461 |
7 | 17491 |
8 | 135226 |
9 | 1103076 |
10 | 9371892 |
11 | 82205622 |
12 | 740254762 |
13 | 6814312822 |
14 | 63920746639 |
15 | 609452784251 |
16 | 5894288690288 |
17 | 57728196873452 |
18 | 571747727911362 |
19 | 5719672404523644 |
20 | 57737110684330278 |
21 | 587604181217075742 |
[1,3,7,21,78,390,2461,17491,135226,1103076, 9371892,82205622,740254762,6814312822,63920746639, 609452784251,5894288690288,57728196873452, 571747727911362,5719672404523644, 57737110684330278,587604181217075742] |