n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 12 |
4 | 40 |
5 | 136 |
6 | 496 |
7 | 1952 |
8 | 7488 |
9 | 30368 |
10 | 123456 |
11 | 512384 |
12 | 2129664 |
13 | 9068672 |
14 | 38391552 |
15 | 165642752 |
16 | 713405952 |
17 | 3109135872 |
18 | 13528865792 |
19 | 59591322624 |
20 | 261549260800 |
21 | 1159547047936 |
22 | 5131968999424 |
23 | 22883893137408 |
24 | 101851069587456 |
25 | 456703499042816 |
26 | 2042949493276672 |
[1,2,4,12,40,136,496,1952,7488,30368,123456, 512384,2129664,9068672,38391552,165642752, 713405952,3109135872,13528865792,59591322624, 261549260800,1159547047936,5131968999424, 22883893137408,101851069587456,456703499042816, 2042949493276672] |