n | a(n) |
---|---|
0 | 1 |
1 | 2 |
2 | 4 |
3 | 9 |
4 | 20 |
5 | 50 |
6 | 125 |
7 | 324 |
8 | 840 |
9 | 2195 |
10 | 5736 |
11 | 15012 |
12 | 39289 |
13 | 102854 |
14 | 269260 |
15 | 704925 |
16 | 1845500 |
17 | 4831574 |
18 | 12649205 |
19 | 33116040 |
20 | 86698896 |
21 | 226980647 |
22 | 594243024 |
23 | 1555748424 |
24 | 4073002225 |
25 | 10663258250 |
26 | 27916772500 |
27 | 73087059249 |
28 | 191344405220 |
[1,2,4,9,20,50,125,324,840,2195,5736,15012,39289, 102854,269260,704925,1845500,4831574,12649205, 33116040,86698896,226980647,594243024,1555748424, 4073002225,10663258250,27916772500,73087059249, 191344405220] |