n | a(n) |
---|---|
1 | 0 |
2 | 0 |
3 | 1 |
4 | 4 |
5 | 10 |
6 | 20 |
7 | 36 |
8 | 65 |
9 | 129 |
10 | 285 |
11 | 661 |
12 | 1521 |
13 | 3394 |
14 | 7359 |
15 | 15706 |
16 | 33457 |
17 | 71760 |
18 | 155248 |
19 | 337745 |
20 | 735723 |
21 | 1600062 |
22 | 3471298 |
23 | 7517368 |
24 | 16269333 |
25 | 35221440 |
26 | 76302420 |
27 | 165392856 |
28 | 358594516 |
29 | 777451793 |
30 | 1685254125 |
31 | 3652428851 |
32 | 7915135727 |
33 | 17152718719 |
34 | 37172960128 |
[0,0,1,4,10,20,36,65,129,285,661,1521,3394,7359, 15706,33457,71760,155248,337745,735723,1600062, 3471298,7517368,16269333,35221440,76302420, 165392856,358594516,777451793,1685254125, 3652428851,7915135727,17152718719,37172960128] |