n | a(n) |
---|---|
1 | 0 |
2 | 6 |
3 | 68 |
4 | 376 |
5 | 1492 |
6 | 4988 |
7 | 15028 |
8 | 42252 |
9 | 113076 |
10 | 291660 |
11 | 731060 |
12 | 1791052 |
13 | 4306868 |
14 | 10197068 |
15 | 23828404 |
16 | 55060556 |
17 | 125999028 |
18 | 285894732 |
19 | 643864500 |
20 | 1440442444 |
21 | 3203438516 |
22 | 7086237772 |
23 | 15599703988 |
24 | 34190878796 |
25 | 74638727092 |
26 | 162339448908 |
[0,6,68,376,1492,4988,15028,42252,113076,291660, 731060,1791052,4306868,10197068,23828404,55060556, 125999028,285894732,643864500,1440442444, 3203438516,7086237772,15599703988,34190878796, 74638727092,162339448908] |