n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 9 |
4 | 20 |
5 | 42 |
6 | 89 |
7 | 189 |
8 | 400 |
9 | 846 |
10 | 1789 |
11 | 3783 |
12 | 8000 |
13 | 16918 |
14 | 35777 |
15 | 75659 |
16 | 160000 |
17 | 338359 |
18 | 715542 |
19 | 1513187 |
20 | 3200000 |
21 | 6767176 |
22 | 14310835 |
23 | 30263731 |
24 | 64000000 |
25 | 135343522 |
26 | 286216701 |
27 | 605274630 |
28 | 1280000000 |
[1,2,4,9,20,42,89,189,400,846,1789,3783,8000, 16918,35777,75659,160000,338359,715542,1513187, 3200000,6767176,14310835,30263731,64000000, 135343522,286216701,605274630,1280000000] |