n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 16 |
3 | 52 |
4 | 156 |
5 | 428 |
6 | 1120 |
7 | 2772 |
8 | 6616 |
9 | 15224 |
10 | 34032 |
11 | 74020 |
12 | 157340 |
13 | 327244 |
14 | 667824 |
15 | 1338828 |
16 | 2641332 |
17 | 5133372 |
18 | 9840432 |
19 | 18621476 |
20 | 34818852 |
21 | 64374564 |
22 | 117768176 |
23 | 213306948 |
24 | 382733816 |
25 | 680630120 |
26 | 1200198784 |
27 | 2099417544 |
28 | 3644332860 |
29 | 6280017740 |
30 | 10746594208 |
[1,4,16,52,156,428,1120,2772,6616,15224,34032, 74020,157340,327244,667824,1338828,2641332, 5133372,9840432,18621476,34818852,64374564, 117768176,213306948,382733816,680630120, 1200198784,2099417544,3644332860,6280017740, 10746594208] |