n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 4 |
4 | 13 |
5 | 40 |
6 | 119 |
7 | 348 |
8 | 1011 |
9 | 2928 |
10 | 8471 |
11 | 24516 |
12 | 71023 |
13 | 206024 |
14 | 598513 |
15 | 1741332 |
16 | 5073733 |
17 | 14804160 |
18 | 43252855 |
19 | 126526756 |
20 | 370551287 |
21 | 1086365336 |
22 | 3188090101 |
23 | 9364411252 |
24 | 27529374201 |
25 | 80993754352 |
26 | 238463467529 |
27 | 702563144252 |
28 | 2071200546129 |
29 | 6109619428824 |
[0,0,1,4,13,40,119,348,1011,2928,8471,24516,71023, 206024,598513,1741332,5073733,14804160,43252855, 126526756,370551287,1086365336,3188090101, 9364411252,27529374201,80993754352,238463467529, 702563144252,2071200546129,6109619428824] |