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.

A223791 Number of 4Xn 0..2 arrays with rows, diagonals and antidiagonals unimodal.

Table of values

n a(n)
1 81
2 6561
3 151580
4 1560013
5 11012718
6 61333566
7 288823579
8 1196519547
9 4468789562
10 15293854291
11 48524120300
12 143996244303
13 402491787780
14 1065874328092
15 2687501352957
16 6479586585575
17 14994608609716
18 33416226803133

List of values

[81, 6561, 151580, 1560013, 11012718, 61333566, 288823579, 1196519547, 4468789562, 15293854291, 48524120300, 143996244303, 402491787780, 1065874328092, 2687501352957, 6479586585575, 14994608609716, 33416226803133]