n | a(n) |
---|---|
0 | 0 |
1 | 2 |
2 | 5 |
3 | 15 |
4 | 32 |
5 | 90 |
6 | 189 |
7 | 527 |
8 | 1104 |
9 | 3074 |
10 | 6437 |
11 | 17919 |
12 | 37520 |
13 | 104442 |
14 | 218685 |
15 | 608735 |
16 | 1274592 |
17 | 3547970 |
18 | 7428869 |
19 | 20679087 |
20 | 43298624 |
21 | 120526554 |
22 | 252362877 |
23 | 702480239 |
24 | 1470878640 |
25 | 4094354882 |
26 | 8572908965 |
27 | 23863649055 |
28 | 49966575152 |
[0,2,5,15,32,90,189,527,1104,3074,6437,17919, 37520,104442,218685,608735,1274592,3547970, 7428869,20679087,43298624,120526554,252362877, 702480239,1470878640,4094354882,8572908965, 23863649055,49966575152] |