n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 0 |
4 | 1 |
5 | 4 |
6 | 11 |
7 | 30 |
8 | 78 |
9 | 205 |
10 | 546 |
11 | 1455 |
12 | 4062 |
13 | 11192 |
14 | 31889 |
15 | 88487 |
16 | 254594 |
17 | 710683 |
18 | 2047705 |
19 | 5711439 |
20 | 16455169 |
21 | 45894868 |
22 | 132118562 |
23 | 368149344 |
24 | 1059171430 |
25 | 2950384277 |
26 | 8484556353 |
[0,0,0,1,4,11,30,78,205,546,1455,4062,11192,31889, 88487,254594,710683,2047705,5711439,16455169, 45894868,132118562,368149344,1059171430, 2950384277,8484556353] |