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.

A052991 Expansion of (1-x-x^2)/(1-3x-x^2).

Table of values

n a(n)
0 1
1 2
2 6
3 20
4 66
5 218
6 720
7 2378
8 7854
9 25940
10 85674
11 282962
12 934560
13 3086642
14 10194486
15 33670100
16 111204786
17 367284458
18 1213058160
19 4006458938
20 13232434974
21 43703763860
22 144343726554
23 476734943522
24 1574548557120
25 5200380614882
26 17175690401766
27 56727451820180

List of values

[1, 2, 6, 20, 66, 218, 720, 2378, 7854, 25940, 85674, 282962, 934560, 3086642, 10194486, 33670100, 111204786, 367284458, 1213058160, 4006458938, 13232434974, 43703763860, 144343726554, 476734943522, 1574548557120, 5200380614882, 17175690401766, 56727451820180]

Started in 1964 by Neil J. A. Sloane | Maintained by The OEIS Foundation Inc.

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