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.

A340887 a(0) = 1; a(n) = Sum_{k=0..n-1} binomial(n,k)^2 * 3^(n-k-1) * a(k).

Table of values

n a(n)
0 1
1 1
2 7
3 99
4 2511
5 99531
6 5680125
7 441226521
8 44766049599
9 5748319130283
10 911271895816077
11 174799606363478361
12 39903413238125862309
13 10690643656077551475921
14 3321750648705212259711063
15 1184831658624977151885176859
16 480843465699932167142334581919

List of values

[1, 1, 7, 99, 2511, 99531, 5680125, 441226521, 44766049599, 5748319130283, 911271895816077, 174799606363478361, 39903413238125862309, 10690643656077551475921, 3321750648705212259711063, 1184831658624977151885176859, 480843465699932167142334581919]