n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 36 |
4 | 108 |
5 | 316 |
6 | 916 |
7 | 2628 |
8 | 7500 |
9 | 21268 |
10 | 60092 |
11 | 169092 |
12 | 474924 |
13 | 1329188 |
14 | 3715244 |
15 | 10359636 |
16 | 28856252 |
17 | 80220244 |
18 | 222847804 |
19 | 618083972 |
20 | 1713283628 |
21 | 4742946484 |
22 | 13123882524 |
23 | 36274940740 |
24 | 100226653420 |
25 | 276669062116 |
26 | 763482430316 |
27 | 2105208491748 |
28 | 5803285527724 |
[1,4,12,36,108,316,916,2628,7500,21268,60092, 169092,474924,1329188,3715244,10359636,28856252, 80220244,222847804,618083972,1713283628, 4742946484,13123882524,36274940740,100226653420, 276669062116,763482430316,2105208491748, 5803285527724] |