n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 4 |
4 | 19 |
5 | 100 |
6 | 566 |
7 | 3384 |
8 | 21107 |
9 | 136084 |
10 | 900674 |
11 | 6087496 |
12 | 41850366 |
13 | 291766952 |
14 | 2057964492 |
15 | 14659421040 |
16 | 105305580483 |
17 | 761981900724 |
18 | 5548736343434 |
19 | 40632122219688 |
20 | 299017702596554 |
21 | 2210275626304248 |
22 | 16403005547059508 |
23 | 122169144755555088 |
24 | 912887876722311406 |
[0,0,1,4,19,100,566,3384,21107,136084,900674, 6087496,41850366,291766952,2057964492,14659421040, 105305580483,761981900724,5548736343434, 40632122219688,299017702596554,2210275626304248, 16403005547059508,122169144755555088, 912887876722311406] |