n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 3 |
4 | 9 |
5 | 25 |
6 | 75 |
7 | 231 |
8 | 763 |
9 | 2619 |
10 | 9495 |
11 | 35695 |
12 | 140151 |
13 | 568503 |
14 | 2390479 |
15 | 10349535 |
16 | 46206735 |
17 | 211799311 |
18 | 997313823 |
19 | 4809701439 |
20 | 23758664095 |
21 | 119952692895 |
22 | 618884638911 |
23 | 3257843882623 |
24 | 17492190577599 |
25 | 95680443760575 |
26 | 532985208200575 |
27 | 3020676745975551 |
[0,1,3,9,25,75,231,763,2619,9495,35695,140151, 568503,2390479,10349535,46206735,211799311, 997313823,4809701439,23758664095,119952692895, 618884638911,3257843882623,17492190577599, 95680443760575,532985208200575,3020676745975551] |