n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 10 |
3 | 20 |
4 | 36 |
5 | 72 |
6 | 220 |
7 | 936 |
8 | 4045 |
9 | 15836 |
10 | 56174 |
11 | 187148 |
12 | 616651 |
13 | 2114448 |
14 | 7717752 |
15 | 29498000 |
16 | 114243269 |
17 | 437915876 |
18 | 1650264874 |
19 | 6149423732 |
20 | 22909545269 |
21 | 86129798600 |
22 | 327872238092 |
23 | 1260466647944 |
24 | 4867739842821 |
25 | 18801022899756 |
26 | 72501445905366 |
[1,4,10,20,36,72,220,936,4045,15836,56174,187148, 616651,2114448,7717752,29498000,114243269, 437915876,1650264874,6149423732,22909545269, 86129798600,327872238092,1260466647944, 4867739842821,18801022899756,72501445905366] |