n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 9 |
4 | 30 |
5 | 90 |
6 | 308 |
7 | 963 |
8 | 3438 |
9 | 11234 |
10 | 40152 |
11 | 135794 |
12 | 490832 |
13 | 1683168 |
14 | 6124726 |
15 | 21354425 |
16 | 78003828 |
17 | 274576966 |
18 | 1008967842 |
19 | 3580440440 |
20 | 13189340250 |
21 | 47178798464 |
22 | 174283519352 |
23 | 626647788638 |
24 | 2320640184718 |
25 | 8387827155210 |
26 | 31116693592454 |
27 | 112928607749642 |
28 | 419803477131832 |
29 | 1528896400255678 |
[1,1,4,9,30,90,308,963,3438,11234,40152,135794, 490832,1683168,6124726,21354425,78003828, 274576966,1008967842,3580440440,13189340250, 47178798464,174283519352,626647788638, 2320640184718,8387827155210,31116693592454, 112928607749642,419803477131832,1528896400255678] |