n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 30 |
4 | 72 |
5 | 168 |
6 | 390 |
7 | 900 |
8 | 2076 |
9 | 4782 |
10 | 11016 |
11 | 25368 |
12 | 58422 |
13 | 134532 |
14 | 309804 |
15 | 713406 |
16 | 1642824 |
17 | 3783048 |
18 | 8711526 |
19 | 20060676 |
20 | 46195260 |
21 | 106377294 |
22 | 244963080 |
23 | 564094968 |
24 | 1298984214 |
25 | 2991269124 |
26 | 6888221772 |
27 | 15862029150 |
28 | 36526694472 |
29 | 84112781928 |
30 | 193692865350 |
[1,4,12,30,72,168,390,900,2076,4782,11016,25368, 58422,134532,309804,713406,1642824,3783048, 8711526,20060676,46195260,106377294,244963080, 564094968,1298984214,2991269124,6888221772, 15862029150,36526694472,84112781928,193692865350] |