n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 5 |
5 | 21 |
6 | 81 |
7 | 302 |
8 | 1107 |
9 | 4027 |
10 | 14608 |
11 | 52988 |
12 | 192501 |
13 | 701065 |
14 | 2560806 |
15 | 9384273 |
16 | 34504203 |
17 | 127288011 |
18 | 471102318 |
19 | 1749063906 |
20 | 6513268401 |
21 | 24323719461 |
22 | 91081800417 |
23 | 341929853235 |
24 | 1286711419527 |
25 | 4852902998951 |
26 | 18341683253676 |
[0,0,0,1,5,21,81,302,1107,4027,14608,52988,192501, 701065,2560806,9384273,34504203,127288011, 471102318,1749063906,6513268401,24323719461, 91081800417,341929853235,1286711419527, 4852902998951,18341683253676] |