n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 16 |
3 | 60 |
4 | 192 |
5 | 596 |
6 | 1776 |
7 | 5020 |
8 | 13760 |
9 | 36916 |
10 | 96336 |
11 | 246316 |
12 | 619392 |
13 | 1530548 |
14 | 3729392 |
15 | 8976364 |
16 | 21337920 |
17 | 50195268 |
18 | 116977232 |
19 | 270114764 |
20 | 618712640 |
21 | 1406843940 |
22 | 3176387120 |
23 | 7126185948 |
24 | 15894370816 |
25 | 35253947940 |
26 | 77796242768 |
27 | 170868178332 |
28 | 373606888128 |
[1,4,16,60,192,596,1776,5020,13760,36916,96336, 246316,619392,1530548,3729392,8976364,21337920, 50195268,116977232,270114764,618712640,1406843940, 3176387120,7126185948,15894370816,35253947940, 77796242768,170868178332,373606888128] |