n | a(n) |
---|---|
1 | 0 |
2 | 1 |
3 | 6 |
4 | 23 |
5 | 76 |
6 | 231 |
7 | 681 |
8 | 1968 |
9 | 5605 |
10 | 15817 |
11 | 44324 |
12 | 123573 |
13 | 343157 |
14 | 950000 |
15 | 2623530 |
16 | 7230746 |
17 | 19896140 |
18 | 54671729 |
19 | 150058028 |
20 | 411465352 |
21 | 1127315946 |
22 | 3086355718 |
23 | 8444524052 |
24 | 23092305853 |
25 | 63117665557 |
26 | 172444844373 |
27 | 470961842866 |
28 | 1285804853026 |
29 | 3509404275438 |
30 | 9575773901601 |
[0,1,6,23,76,231,681,1968,5605,15817,44324,123573, 343157,950000,2623530,7230746,19896140,54671729, 150058028,411465352,1127315946,3086355718, 8444524052,23092305853,63117665557,172444844373, 470961842866,1285804853026,3509404275438, 9575773901601] |