cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A247309 Rectangular array read upwards by columns: T = T(n,k) = number of paths from (0,1) to (n,k), where 0 <= k <= 2, consisting of segments given by the vectors (1,1), (1,0), (1,-1), (1,-2).

Table of values

n a(n)
0 1
1 0
2 0
3 1
4 1
5 1
6 2
7 3
8 3
9 5
10 8
11 8
12 13
13 21
14 21
15 34
16 55
17 55
18 89
19 144
20 144
21 233
22 377
23 377
24 610
25 987
26 987
27 1597
28 2584
29 2584
30 4181
31 6765
32 6765
33 10946
34 17711
35 17711
36 28657
37 46368
38 46368
39 75025
40 121393
41 121393
42 196418
43 317811
44 317811
45 514229
46 832040
47 832040

List of values

[1, 0, 0, 1, 1, 1, 2, 3, 3, 5, 8, 8, 13, 21, 21, 34, 55, 55, 89, 144, 144, 233, 377, 377, 610, 987, 987, 1597, 2584, 2584, 4181, 6765, 6765, 10946, 17711, 17711, 28657, 46368, 46368, 75025, 121393, 121393, 196418, 317811, 317811, 514229, 832040, 832040]