n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 0 |
3 | 0 |
4 | 0 |
5 | 0 |
6 | 0 |
7 | 4 |
8 | 6 |
9 | 15 |
10 | 24 |
11 | 40 |
12 | 69 |
13 | 138 |
14 | 396 |
15 | 1028 |
16 | 3062 |
17 | 8269 |
18 | 21680 |
19 | 50955 |
20 | 115457 |
21 | 262239 |
22 | 631393 |
23 | 1666438 |
24 | 4558051 |
25 | 12913587 |
26 | 35530351 |
27 | 95825467 |
28 | 246943968 |
29 | 628040166 |
30 | 1607703060 |
31 | 4228528070 |
32 | 11485131123 |
33 | 31616483271 |
34 | 88141192570 |
35 | 243487667830 |
[1,1,0,0,0,0,0,4,6,15,24,40,69,138,396,1028,3062, 8269,21680,50955,115457,262239,631393,1666438, 4558051,12913587,35530351,95825467,246943968, 628040166,1607703060,4228528070,11485131123, 31616483271,88141192570,243487667830] |