n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 15 |
4 | 56 |
5 | 213 |
6 | 813 |
7 | 3104 |
8 | 9632089 |
9 | 36787239 |
10 | 140499215 |
11 | 2049402728 |
12 | 7827156489 |
13 | 29893772401 |
14 | 6360445726168 |
15 | 24292055125871 |
16 | 354337952833519 |
17 | 5168578128432327 |
18 | 19740029272114749 |
19 | 4200051540382303047 |
20 | 16040995858310522148 |
21 | 233983234616956426935 |
22 | 893637628328498285466 |
23 | 3413014663516027432461 |
[1,4,15,56,213,813,3104,9632089,36787239, 140499215,2049402728,7827156489,29893772401, 6360445726168,24292055125871,354337952833519, 5168578128432327,19740029272114749, 4200051540382303047,16040995858310522148, 233983234616956426935,893637628328498285466, 3413014663516027432461] |