n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 2 |
3 | 6 |
4 | 14 |
5 | 31 |
6 | 104 |
7 | 344 |
8 | 1084 |
9 | 3236 |
10 | 9784 |
11 | 29964 |
12 | 92241 |
13 | 282780 |
14 | 865064 |
15 | 2646292 |
16 | 8102454 |
17 | 24813838 |
18 | 75982346 |
19 | 232630527 |
20 | 712230076 |
21 | 2180675264 |
22 | 6676819512 |
23 | 20443032008 |
24 | 62591840320 |
25 | 191641545768 |
26 | 586762729889 |
27 | 1796535598952 |
28 | 5500587026592 |
[0,0,2,6,14,31,104,344,1084,3236,9784,29964,92241, 282780,865064,2646292,8102454,24813838,75982346, 232630527,712230076,2180675264,6676819512, 20443032008,62591840320,191641545768,586762729889, 1796535598952,5500587026592] |