n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 9 |
3 | 20 |
4 | 46 |
5 | 103 |
6 | 233 |
7 | 525 |
8 | 1182 |
9 | 2660 |
10 | 5985 |
11 | 13467 |
12 | 30301 |
13 | 68178 |
14 | 153401 |
15 | 345152 |
16 | 776591 |
17 | 1747331 |
18 | 3931496 |
19 | 8845866 |
20 | 19903198 |
21 | 44782196 |
22 | 100759940 |
23 | 226709866 |
24 | 510097200 |
25 | 1147718700 |
26 | 2582367076 |
27 | 5810325920 |
28 | 13073233321 |
29 | 29414774973 |
[1,4,9,20,46,103,233,525,1182,2660,5985,13467, 30301,68178,153401,345152,776591,1747331,3931496, 8845866,19903198,44782196,100759940,226709866, 510097200,1147718700,2582367076,5810325920, 13073233321,29414774973] |