n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 5 |
4 | 33 |
5 | 193 |
6 | 1169 |
7 | 6993 |
8 | 42001 |
9 | 251921 |
10 | 1511697 |
11 | 9069841 |
12 | 54419729 |
13 | 326517009 |
14 | 1959104785 |
15 | 11754623249 |
16 | 70527750417 |
17 | 423166480657 |
18 | 2538998927633 |
19 | 15233993478417 |
20 | 91403961045265 |
21 | 548423765922065 |
[0,0,1,5,33,193,1169,6993,42001,251921,1511697, 9069841,54419729,326517009,1959104785,11754623249, 70527750417,423166480657,2538998927633, 15233993478417,91403961045265,548423765922065] |