n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 9 |
5 | 20 |
6 | 48 |
7 | 116 |
8 | 288 |
9 | 724 |
10 | 1849 |
11 | 4768 |
12 | 12423 |
13 | 32628 |
14 | 86342 |
15 | 229952 |
16 | 616042 |
17 | 1659012 |
18 | 4489101 |
19 | 12199521 |
20 | 33284546 |
21 | 91140797 |
22 | 250396629 |
23 | 690043032 |
24 | 1907022197 |
25 | 5284167884 |
26 | 14677681554 |
27 | 40862469713 |
28 | 114001697975 |
[1,1,2,4,9,20,48,116,288,724,1849,4768,12423, 32628,86342,229952,616042,1659012,4489101, 12199521,33284546,91140797,250396629,690043032, 1907022197,5284167884,14677681554,40862469713, 114001697975] |