n | a(n) |
---|---|
0 | 1 |
1 | 3 |
2 | 12 |
3 | 52 |
4 | 237 |
5 | 1119 |
6 | 5424 |
7 | 26832 |
8 | 134913 |
9 | 687443 |
10 | 3541932 |
11 | 18421524 |
12 | 96585597 |
13 | 509960223 |
14 | 2709067968 |
15 | 14469453632 |
16 | 77655751329 |
17 | 418567792899 |
18 | 2264867271852 |
19 | 12298297439892 |
20 | 66993811842477 |
21 | 366009125766463 |
[1,3,12,52,237,1119,5424,26832,134913,687443, 3541932,18421524,96585597,509960223,2709067968, 14469453632,77655751329,418567792899, 2264867271852,12298297439892,66993811842477, 366009125766463] |