n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 9 |
5 | 20 |
6 | 54 |
7 | 146 |
8 | 436 |
9 | 1372 |
10 | 4577 |
11 | 15971 |
12 | 58376 |
13 | 221876 |
14 | 876012 |
15 | 3583099 |
16 | 15159817 |
17 | 66248609 |
18 | 298678064 |
19 | 1387677971 |
20 | 6637246978 |
21 | 32648574416 |
22 | 165002122350 |
23 | 855937433641 |
24 | 4553114299140 |
25 | 24813471826280 |
26 | 138417885372373 |
27 | 789683693019999 |
28 | 4603838061688077 |
[1,1,2,4,9,20,54,146,436,1372,4577,15971,58376, 221876,876012,3583099,15159817,66248609,298678064, 1387677971,6637246978,32648574416,165002122350, 855937433641,4553114299140,24813471826280, 138417885372373,789683693019999,4603838061688077] |