n | a(n) |
---|---|
1 | 1 |
2 | 4 |
3 | 21 |
4 | 111 |
5 | 592 |
6 | 3171 |
7 | 17021 |
8 | 91456 |
9 | 491641 |
10 | 2643523 |
11 | 14215596 |
12 | 76448559 |
13 | 411134641 |
14 | 2211076788 |
15 | 11891207045 |
16 | 63951270079 |
17 | 343932277888 |
18 | 1849681481203 |
19 | 9947663349453 |
20 | 53498950981392 |
21 | 287719621233865 |
22 | 1547368337500659 |
23 | 8321812723167356 |
24 | 44755063012476127 |
[1,4,21,111,592,3171,17021,91456,491641,2643523, 14215596,76448559,411134641,2211076788, 11891207045,63951270079,343932277888, 1849681481203,9947663349453,53498950981392, 287719621233865,1547368337500659,8321812723167356, 44755063012476127] |