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.

A317506 Triangle read by rows: T(0,0) = 1; T(n,k) = 2 T(n-1,k) - T(n-4,k-1) for 0 <= k <= floor(n/4); T(n,k)=0 for n or k < 0.

Table of values

n a(n)
0 1
1 2
2 4
3 8
4 16
5 -1
6 32
7 -4
8 64
9 -12
10 128
11 -32
12 256
13 -80
14 1
15 512
16 -192
17 6
18 1024
19 -448
20 24
21 2048
22 -1024
23 80
24 4096
25 -2304
26 240
27 -1
28 8192
29 -5120
30 672
31 -8
32 16384
33 -11264
34 1792
35 -40
36 32768
37 -24576
38 4608
39 -160
40 65536
41 -53248
42 11520
43 -560
44 1
45 131072
46 -114688
47 28160
48 -1792
49 10

List of values

[1, 2, 4, 8, 16, -1, 32, -4, 64, -12, 128, -32, 256, -80, 1, 512, -192, 6, 1024, -448, 24, 2048, -1024, 80, 4096, -2304, 240, -1, 8192, -5120, 672, -8, 16384, -11264, 1792, -40, 32768, -24576, 4608, -160, 65536, -53248, 11520, -560, 1, 131072, -114688, 28160, -1792, 10]