n | a(n) |
---|---|
0 | 1 |
1 | 4 |
2 | 13 |
3 | 36 |
4 | 113 |
5 | 487 |
6 | 1036 |
7 | 3214 |
8 | 10456 |
9 | 36786 |
10 | 100963 |
11 | 319656 |
12 | 1001964 |
13 | 3165969 |
14 | 10001786 |
15 | 31626854 |
16 | 100013919 |
17 | 316256807 |
18 | 1000029656 |
19 | 3162322481 |
20 | 10000115537 |
[1,4,13,36,113,487,1036,3214,10456,36786,100963, 319656,1001964,3165969,10001786,31626854, 100013919,316256807,1000029656,3162322481, 10000115537] |