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.

A190139 a(n) = 2*a(n-1) + a(n-2) + a(n-3) + a(n-4), a(-2)=0, a(-1)=0, a(0)=1, a(1)=1.

Table of values

n a(n)
0 1
1 1
2 3
3 8
4 21
5 54
6 140
7 363
8 941
9 2439
10 6322
11 16387
12 42476
13 110100
14 285385
15 739733
16 1917427
17 4970072
18 12882689
19 33392610
20 86555408
21 224356187
22 581543081
23 1507390367
24 3907235410
25 10127760455
26 26251689768
27 68045765768
28 176378217169
29 457181650329
30 1185038973363

List of values

[1, 1, 3, 8, 21, 54, 140, 363, 941, 2439, 6322, 16387, 42476, 110100, 285385, 739733, 1917427, 4970072, 12882689, 33392610, 86555408, 224356187, 581543081, 1507390367, 3907235410, 10127760455, 26251689768, 68045765768, 176378217169, 457181650329, 1185038973363]