n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 5 |
4 | 21 |
5 | 79 |
6 | 281 |
7 | 963 |
8 | 3217 |
9 | 10547 |
10 | 34089 |
11 | 108955 |
12 | 345137 |
13 | 1085331 |
14 | 3392377 |
15 | 10549739 |
16 | 32667201 |
17 | 100782787 |
18 | 309946697 |
19 | 950599131 |
20 | 2908512145 |
21 | 8880484019 |
22 | 27064776729 |
23 | 82350874699 |
24 | 250212362465 |
25 | 759269653155 |
26 | 2301393567721 |
27 | 6968615051195 |
[0,0,1,5,21,79,281,963,3217,10547,34089,108955, 345137,1085331,3392377,10549739,32667201, 100782787,309946697,950599131,2908512145, 8880484019,27064776729,82350874699,250212362465, 759269653155,2301393567721,6968615051195] |