n | a(n) |
---|---|
0 | 2 |
1 | 4 |
2 | 18 |
3 | 76 |
4 | 322 |
5 | 1364 |
6 | 5778 |
7 | 24476 |
8 | 103682 |
9 | 439204 |
10 | 1860498 |
11 | 7881196 |
12 | 33385282 |
13 | 141422324 |
14 | 599074578 |
15 | 2537720636 |
16 | 10749957122 |
17 | 45537549124 |
18 | 192900153618 |
19 | 817138163596 |
20 | 3461452808002 |
21 | 14662949395604 |
22 | 62113250390418 |
[2,4,18,76,322,1364,5778,24476,103682,439204, 1860498,7881196,33385282,141422324,599074578, 2537720636,10749957122,45537549124,192900153618, 817138163596,3461452808002,14662949395604, 62113250390418] |