n | a(n) |
---|---|
0 | 0 |
1 | 1 |
2 | 4 |
3 | 7 |
4 | 16 |
5 | 61 |
6 | 160 |
7 | 547 |
8 | 1456 |
9 | 5110 |
10 | 13120 |
11 | 44287 |
12 | 118096 |
13 | 398581 |
14 | 1075840 |
15 | 3720094 |
16 | 9565936 |
17 | 32285041 |
18 | 86093440 |
19 | 290565367 |
20 | 774840976 |
21 | 2711943430 |
22 | 7059662080 |
23 | 23535794707 |
24 | 61987278400 |
25 | 212693848522 |
26 | 564945153280 |
27 | 1979718703900 |
28 | 5083731656656 |
[0,1,4,7,16,61,160,547,1456,5110,13120,44287, 118096,398581,1075840,3720094,9565936,32285041, 86093440,290565367,774840976,2711943430, 7059662080,23535794707,61987278400,212693848522, 564945153280,1979718703900,5083731656656] |