n | a(n) |
---|---|
0 | 0 |
1 | 0 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 9 |
6 | 33 |
7 | 79 |
8 | 250 |
9 | 647 |
10 | 1914 |
11 | 5157 |
12 | 14797 |
13 | 40663 |
14 | 115036 |
15 | 319098 |
16 | 896896 |
17 | 2498663 |
18 | 7002446 |
19 | 19546383 |
20 | 54706009 |
21 | 152839003 |
22 | 427510168 |
23 | 1194858679 |
24 | 3341293220 |
25 | 9340298995 |
26 | 26116085175 |
27 | 73010960431 |
28 | 204132824544 |
29 | 570699926244 |
30 | 1595594838888 |
[0,0,0,1,4,9,33,79,250,647,1914,5157,14797,40663, 115036,319098,896896,2498663,7002446,19546383, 54706009,152839003,427510168,1194858679, 3341293220,9340298995,26116085175,73010960431, 204132824544,570699926244,1595594838888] |