n | a(n) |
---|---|
0 | 1 |
1 | 6 |
2 | 30 |
3 | 128 |
4 | 486 |
5 | 1704 |
6 | 5604 |
7 | 17484 |
8 | 52206 |
9 | 150118 |
10 | 417696 |
11 | 1128984 |
12 | 2973476 |
13 | 7650720 |
14 | 19272432 |
15 | 47616568 |
16 | 115570014 |
17 | 275921460 |
18 | 648771802 |
19 | 1503889488 |
20 | 3439990344 |
21 | 7770915816 |
22 | 17349229908 |
23 | 38306180052 |
24 | 83694778556 |
25 | 181052778078 |
26 | 387976101432 |
27 | 823939048560 |
[1,6,30,128,486,1704,5604,17484,52206,150118, 417696,1128984,2973476,7650720,19272432,47616568, 115570014,275921460,648771802,1503889488, 3439990344,7770915816,17349229908,38306180052, 83694778556,181052778078,387976101432, 823939048560] |