n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 1 |
3 | 7 |
4 | 26 |
5 | 72 |
6 | 171 |
7 | 371 |
8 | 760 |
9 | 1500 |
10 | 2889 |
11 | 5475 |
12 | 10266 |
13 | 19116 |
14 | 35435 |
15 | 65495 |
16 | 120832 |
17 | 222664 |
18 | 410017 |
19 | 754671 |
20 | 1388650 |
21 | 2554784 |
22 | 4699707 |
23 | 8644907 |
24 | 15901336 |
25 | 29248068 |
26 | 53796617 |
27 | 98948523 |
28 | 181995914 |
29 | 334743972 |
30 | 615691547 |
[0,0,1,7,26,72,171,371,760,1500,2889,5475,10266, 19116,35435,65495,120832,222664,410017,754671, 1388650,2554784,4699707,8644907,15901336,29248068, 53796617,98948523,181995914,334743972,615691547] |