n | a(n) |
---|---|
0 | 1 |
1 | 1 |
2 | 4 |
3 | 7 |
4 | 21 |
5 | 40 |
6 | 106 |
7 | 216 |
8 | 534 |
9 | 1139 |
10 | 2715 |
11 | 5962 |
12 | 14012 |
13 | 31420 |
14 | 73484 |
15 | 167617 |
16 | 392714 |
17 | 908600 |
18 | 2140429 |
19 | 5015655 |
20 | 11905145 |
21 | 28228533 |
22 | 67590229 |
23 | 162067916 |
24 | 391695348 |
25 | 949359190 |
26 | 2316618809 |
27 | 5673557284 |
28 | 13979155798 |
29 | 34583650498 |
30 | 86034613145 |
31 | 214948212879 |
[1,1,4,7,21,40,106,216,534,1139,2715,5962,14012, 31420,73484,167617,392714,908600,2140429,5015655, 11905145,28228533,67590229,162067916,391695348, 949359190,2316618809,5673557284,13979155798, 34583650498,86034613145,214948212879] |