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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.

A219673 a(n) = Sum_{k=0..n} binomial(n,k)^2*Lucas(k) where Lucas(n) = A000032(n).

Table of values

n a(n)
0 2
1 3
2 9
3 42
4 197
5 913
6 4302
7 20611
8 99773
9 486438
10 2385319
11 11752931
12 58139858
13 288572079
14 1436398329
15 7167499522
16 35842352013
17 179576501169
18 901226053422
19 4529717794607
20 22797936691207
21 114881558737498
22 579544350869889
23 2926592507364717
24 14792448049794122

List of values

[2, 3, 9, 42, 197, 913, 4302, 20611, 99773, 486438, 2385319, 11752931, 58139858, 288572079, 1436398329, 7167499522, 35842352013, 179576501169, 901226053422, 4529717794607, 22797936691207, 114881558737498, 579544350869889, 2926592507364717, 14792448049794122]

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

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