n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 13 |
3 | 39 |
4 | 114 |
5 | 330 |
6 | 948 |
7 | 2703 |
8 | 7655 |
9 | 21554 |
10 | 60389 |
11 | 168468 |
12 | 468199 |
13 | 1296826 |
14 | 3581185 |
15 | 9862749 |
16 | 27096216 |
17 | 74277342 |
18 | 203200986 |
19 | 554869701 |
20 | 1512575195 |
21 | 4116813032 |
22 | 11188568267 |
23 | 30367047720 |
24 | 82316338381 |
25 | 222875101936 |
26 | 602784607477 |
27 | 1628612506131 |
[1,4,13,39,114,330,948,2703,7655,21554,60389, 168468,468199,1296826,3581185,9862749,27096216, 74277342,203200986,554869701,1512575195, 4116813032,11188568267,30367047720,82316338381, 222875101936,602784607477,1628612506131] |