n | a(n) |
---|---|
1 | 0 |
2 | 2 |
3 | 18 |
4 | 116 |
5 | 650 |
6 | 3372 |
7 | 16660 |
8 | 79592 |
9 | 371034 |
10 | 1697660 |
11 | 7654460 |
12 | 34106712 |
13 | 150499908 |
14 | 658707896 |
15 | 2863150440 |
16 | 12371226064 |
17 | 53178791162 |
18 | 227561427612 |
19 | 969890051884 |
20 | 4119092850680 |
21 | 17438036501676 |
22 | 73611934643368 |
23 | 309935825654168 |
24 | 1301878616066736 |
[0,2,18,116,650,3372,16660,79592,371034,1697660, 7654460,34106712,150499908,658707896,2863150440, 12371226064,53178791162,227561427612,969890051884, 4119092850680,17438036501676,73611934643368, 309935825654168,1301878616066736] |