n | a(n) |
---|---|
0 | 0 |
1 | 3 |
2 | 6 |
3 | 21 |
4 | 48 |
5 | 195 |
6 | 462 |
7 | 1917 |
8 | 4560 |
9 | 18963 |
10 | 45126 |
11 | 187701 |
12 | 446688 |
13 | 1858035 |
14 | 4421742 |
15 | 18392637 |
16 | 43770720 |
17 | 182068323 |
18 | 433285446 |
19 | 1802290581 |
20 | 4289083728 |
21 | 17840837475 |
22 | 42457551822 |
23 | 176606084157 |
24 | 420286434480 |
25 | 1748220004083 |
[0,3,6,21,48,195,462,1917,4560,18963,45126,187701, 446688,1858035,4421742,18392637,43770720, 182068323,433285446,1802290581,4289083728, 17840837475,42457551822,176606084157,420286434480, 1748220004083] |