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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.

A213785 a(n) = Sum(P(i)*P(j), 1<=i where P(k) is the k-th Pell number A000129(k).

Table of values

n a(n)
0 0
1 0
2 2
3 17
4 113
5 693
6 4123
7 24234
8 141738
9 827298
10 4824716
11 28127435
12 163955435
13 955642695
14 5569991317
15 32464523892
16 189217679988
17 1102842830628
18 6427842380918
19 37464218883749
20 218357488856453
21 1272680757553593
22 7417727160997231
23 43233682460792670

List of values

[0, 0, 2, 17, 113, 693, 4123, 24234, 141738, 827298, 4824716, 28127435, 163955435, 955642695, 5569991317, 32464523892, 189217679988, 1102842830628, 6427842380918, 37464218883749, 218357488856453, 1272680757553593, 7417727160997231, 43233682460792670]

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

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