n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 6 |
4 | 15 |
5 | 39 |
6 | 116 |
7 | 340 |
8 | 1001 |
9 | 3041 |
10 | 9322 |
11 | 28718 |
12 | 89363 |
13 | 279987 |
14 | 881376 |
15 | 2788464 |
16 | 8860677 |
17 | 28256709 |
18 | 90407666 |
19 | 290124182 |
20 | 933482527 |
21 | 3010689527 |
22 | 9731366060 |
23 | 31516942060 |
24 | 102259648701 |
25 | 332347297141 |
26 | 1081810639970 |
27 | 3526399820374 |
28 | 11510355762339 |
29 | 37616896717155 |
[1,1,2,6,15,39,116,340,1001,3041,9322,28718,89363, 279987,881376,2788464,8860677,28256709,90407666, 290124182,933482527,3010689527,9731366060, 31516942060,102259648701,332347297141, 1081810639970,3526399820374,11510355762339, 37616896717155] |