n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 9 |
4 | 43 |
5 | 165 |
6 | 571 |
7 | 1869 |
8 | 5923 |
9 | 18405 |
10 | 56491 |
11 | 172029 |
12 | 521203 |
13 | 1573845 |
14 | 4742011 |
15 | 14266989 |
16 | 42882883 |
17 | 128812485 |
18 | 386765131 |
19 | 1160950749 |
20 | 3484162963 |
21 | 10455110325 |
22 | 31370573851 |
23 | 94122207309 |
24 | 282387593443 |
25 | 847204723365 |
26 | 2541698056171 |
27 | 7625261940669 |
[0,0,1,9,43,165,571,1869,5923,18405,56491,172029, 521203,1573845,4742011,14266989,42882883, 128812485,386765131,1160950749,3484162963, 10455110325,31370573851,94122207309,282387593443, 847204723365,2541698056171,7625261940669] |