n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 12 |
3 | 30 |
4 | 84 |
5 | 9150 |
6 | 47244 |
7 | 75360 |
8 | 177287 |
9 | 281868 |
10 | 705790 |
11 | 3043504 |
12 | 9669715 |
13 | 20139930 |
14 | 32043111 |
15 | 67447484 |
16 | 291217662 |
17 | 7544909388 |
18 | 8396469108 |
19 | 21425170627 |
[1,4,12,30,84,9150,47244,75360,177287,281868, 705790,3043504,9669715,20139930,32043111,67447484, 291217662,7544909388,8396469108,21425170627] |