n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 2 |
3 | 4 |
4 | 10 |
5 | 26 |
6 | 76 |
7 | 232 |
8 | 764 |
9 | 2620 |
10 | 8732 |
11 | 28068 |
12 | 88448 |
13 | 273590 |
14 | 839026 |
15 | 2559590 |
16 | 7810344 |
17 | 23899859 |
18 | 73552737 |
19 | 227149812 |
20 | 702978992 |
21 | 2177474284 |
22 | 6745619532 |
23 | 20888771872 |
24 | 64643999584 |
25 | 199916632224 |
26 | 617935452464 |
27 | 1909553806592 |
28 | 5900616453456 |
29 | 18234154867712 |
[1,1,2,4,10,26,76,232,764,2620,8732,28068,88448, 273590,839026,2559590,7810344,23899859,73552737, 227149812,702978992,2177474284,6745619532, 20888771872,64643999584,199916632224,617935452464, 1909553806592,5900616453456,18234154867712] |