n | a(n) |
---|---|
0 | 1 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 2 |
5 | 4 |
6 | 9 |
7 | 21 |
8 | 51 |
9 | 127 |
10 | 323 |
11 | 835 |
12 | 2188 |
13 | 5798 |
14 | 15511 |
15 | 41835 |
16 | 113634 |
17 | 310572 |
18 | 853467 |
19 | 2356779 |
20 | 6536382 |
21 | 18199284 |
22 | 50852019 |
23 | 142547559 |
24 | 400763223 |
25 | 1129760415 |
26 | 3192727797 |
27 | 9043402501 |
28 | 25669818476 |
29 | 73007772802 |
30 | 208023278209 |
[1,0,1,1,2,4,9,21,51,127,323,835,2188,5798,15511, 41835,113634,310572,853467,2356779,6536382, 18199284,50852019,142547559,400763223,1129760415, 3192727797,9043402501,25669818476,73007772802, 208023278209] |