n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 13 |
4 | 46 |
5 | 160 |
6 | 559 |
7 | 1951 |
8 | 6811 |
9 | 23776 |
10 | 82999 |
11 | 289738 |
12 | 1011436 |
13 | 3530785 |
14 | 12325489 |
15 | 43026601 |
16 | 150199996 |
17 | 524327701 |
18 | 1830356494 |
19 | 6389524888 |
20 | 22304959951 |
21 | 77863573135 |
22 | 271811114419 |
23 | 948855529576 |
24 | 3312325244431 |
25 | 11562875678026 |
26 | 40364421993364 |
27 | 140906692091713 |
[1,4,13,46,160,559,1951,6811,23776,82999,289738, 1011436,3530785,12325489,43026601,150199996, 524327701,1830356494,6389524888,22304959951, 77863573135,271811114419,948855529576, 3312325244431,11562875678026,40364421993364, 140906692091713] |