n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 18 |
5 | 57 |
6 | 190 |
7 | 654 |
8 | 2306 |
9 | 8290 |
10 | 30272 |
11 | 111973 |
12 | 418666 |
13 | 1579803 |
14 | 6008464 |
15 | 23009240 |
16 | 88645034 |
17 | 343334976 |
18 | 1336105472 |
19 | 5221667740 |
20 | 20485272152 |
21 | 80645855014 |
22 | 318489386884 |
23 | 1261428593649 |
24 | 5009356014722 |
25 | 19941674099985 |
[1,1,2,6,18,57,190,654,2306,8290,30272,111973, 418666,1579803,6008464,23009240,88645034, 343334976,1336105472,5221667740,20485272152, 80645855014,318489386884,1261428593649, 5009356014722,19941674099985] |