n | a(n) |
---|---|
3 | 1 |
4 | 5 |
5 | 20 |
6 | 71 |
7 | 237 |
8 | 761 |
9 | 2377 |
10 | 7278 |
11 | 21945 |
12 | 65375 |
13 | 192861 |
14 | 564387 |
15 | 1640496 |
16 | 4741103 |
17 | 13634501 |
18 | 39042437 |
19 | 111379025 |
20 | 316687006 |
21 | 897796581 |
22 | 2538530615 |
23 | 7160768785 |
24 | 20156241155 |
25 | 56626360256 |
26 | 158804376883 |
27 | 444638710925 |
28 | 1243115597929 |
29 | 3470779612521 |
30 | 9678320566654 |
[1,5,20,71,237,761,2377,7278,21945,65375,192861, 564387,1640496,4741103,13634501,39042437, 111379025,316687006,897796581,2538530615, 7160768785,20156241155,56626360256,158804376883, 444638710925,1243115597929,3470779612521, 9678320566654] |