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.

A212473 Number of 0..3 arrays of length 2*n+1 with sum no more than 3*n in any length 2n subsequence (=50% duty cycle).

Table of values

n a(n)
1 30
2 486
3 7862
4 126606
5 2034200
6 32644314
7 523487828
8 8390738062
9 134446993320
10 2153764911576
11 34495886876214
12 552428007496418
13 8845775486728392
14 141630619844515292
15 2267494906950636872
16 36300174404152871822

List of values

[30, 486, 7862, 126606, 2034200, 32644314, 523487828, 8390738062, 134446993320, 2153764911576, 34495886876214, 552428007496418, 8845775486728392, 141630619844515292, 2267494906950636872, 36300174404152871822]