n | a(n) |
---|---|
0 | 1 |
1 | 8 |
2 | 52 |
3 | 272 |
4 | 1274 |
5 | 5408 |
6 | 21448 |
7 | 80080 |
8 | 285043 |
9 | 972496 |
10 | 3200644 |
11 | 10199456 |
12 | 31592350 |
13 | 95366176 |
14 | 281269560 |
15 | 812094448 |
16 | 2299480441 |
17 | 6394796832 |
18 | 17489643664 |
19 | 47096042032 |
20 | 124993380566 |
21 | 327249781952 |
[1,8,52,272,1274,5408,21448,80080,285043,972496, 3200644,10199456,31592350,95366176,281269560, 812094448,2299480441,6394796832,17489643664, 47096042032,124993380566,327249781952] |