n | a(n) |
---|---|
4 | 1 |
5 | 4 |
6 | 17 |
7 | 66 |
8 | 254 |
9 | 956 |
10 | 3584 |
11 | 13256 |
12 | 49052 |
13 | 179552 |
14 | 658560 |
15 | 2394504 |
16 | 8724464 |
17 | 31575096 |
18 | 114451388 |
19 | 412811544 |
20 | 1490190544 |
21 | 5360943684 |
22 | 19288139802 |
23 | 69245171564 |
24 | 248463024330 |
25 | 890477645192 |
26 | 3188033497580 |
27 | 11409453277272 |
28 | 40771092374710 |
29 | 145735210316376 |
30 | 519955750491512 |
[1,4,17,66,254,956,3584,13256,49052,179552,658560, 2394504,8724464,31575096,114451388,412811544, 1490190544,5360943684,19288139802,69245171564, 248463024330,890477645192,3188033497580, 11409453277272,40771092374710,145735210316376, 519955750491512] |