n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 3 |
3 | 6 |
4 | 19 |
5 | 56 |
6 | 186 |
7 | 615 |
8 | 2127 |
9 | 7467 |
10 | 26720 |
11 | 96801 |
12 | 354901 |
13 | 1313293 |
14 | 4900266 |
15 | 18413166 |
16 | 69620351 |
17 | 264673536 |
18 | 1011100541 |
19 | 3879382837 |
20 | 14942671683 |
21 | 57760251344 |
22 | 223988614094 |
23 | 871159201568 |
24 | 3397330833310 |
25 | 13281696243924 |
26 | 52042973504510 |
27 | 204357290336561 |
28 | 804029764090404 |
[1,1,3,6,19,56,186,615,2127,7467,26720,96801, 354901,1313293,4900266,18413166,69620351, 264673536,1011100541,3879382837,14942671683, 57760251344,223988614094,871159201568, 3397330833310,13281696243924,52042973504510, 204357290336561,804029764090404] |