n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 1 |
4 | 4 |
5 | 12 |
6 | 33 |
7 | 97 |
8 | 280 |
9 | 808 |
10 | 2337 |
11 | 6753 |
12 | 19516 |
13 | 56404 |
14 | 163009 |
15 | 471105 |
16 | 1361520 |
17 | 3934864 |
18 | 11371969 |
19 | 32865601 |
20 | 94983348 |
21 | 274506972 |
22 | 793339873 |
23 | 2292794785 |
24 | 6626299912 |
25 | 19150362168 |
26 | 55345573857 |
27 | 159951677089 |
28 | 462268926316 |
29 | 1335981992356 |
30 | 3861059617665 |
[0,0,1,1,4,12,33,97,280,808,2337,6753,19516,56404, 163009,471105,1361520,3934864,11371969,32865601, 94983348,274506972,793339873,2292794785, 6626299912,19150362168,55345573857,159951677089, 462268926316,1335981992356,3861059617665] |