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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.

A084773 Coefficients of 1/sqrt(1-12*x+4*x^2); also, a(n) is the central coefficient of (1+6*x+8*x^2)^n.

Table of values

n a(n)
0 1
1 6
2 52
3 504
4 5136
5 53856
6 575296
7 6225792
8 68026624
9 748832256
10 8291791872
11 92255680512
12 1030537089024
13 11550176206848
14 129824329777152
15 1462841567576064
16 16518691986407424
17 186887008999047168
18 2117944490818011136
19 24038305911245635584
20 273199990096465494016

List of values

[1, 6, 52, 504, 5136, 53856, 575296, 6225792, 68026624, 748832256, 8291791872, 92255680512, 1030537089024, 11550176206848, 129824329777152, 1462841567576064, 16518691986407424, 186887008999047168, 2117944490818011136, 24038305911245635584, 273199990096465494016]

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

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