n | a(n) |
---|---|
1 | 2 |
2 | 6 |
3 | 18 |
4 | 50 |
5 | 105 |
6 | 181 |
7 | 316 |
8 | 560 |
9 | 969 |
10 | 1777 |
11 | 3699 |
12 | 8370 |
13 | 18297 |
14 | 36978 |
15 | 73912 |
16 | 155816 |
17 | 335928 |
18 | 697052 |
19 | 1360137 |
20 | 2539247 |
21 | 4757378 |
22 | 9452951 |
23 | 20357207 |
24 | 46362252 |
25 | 107298090 |
26 | 244529803 |
27 | 538892048 |
28 | 1146917302 |
29 | 2392827002 |
30 | 4981802096 |
[2,6,18,50,105,181,316,560,969,1777,3699,8370, 18297,36978,73912,155816,335928,697052,1360137, 2539247,4757378,9452951,20357207,46362252, 107298090,244529803,538892048,1146917302, 2392827002,4981802096] |