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.

A303080 Number of n X 4 0..1 arrays with every element equal to 0, 2, 3, 4 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 1
2 20
3 29
4 90
5 304
6 1054
7 4182
8 17369
9 75377
10 335199
11 1511973
12 6877743
13 31436925
14 144097153
15 661586920
16 3040460522
17 13981091806
18 64311876578
19 295889956660
20 1361516449806
21 6265388048955
22 28833190731421
23 132693419071842

List of values

[1, 20, 29, 90, 304, 1054, 4182, 17369, 75377, 335199, 1511973, 6877743, 31436925, 144097153, 661586920, 3040460522, 13981091806, 64311876578, 295889956660, 1361516449806, 6265388048955, 28833190731421, 132693419071842]

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

Content is available under The OEIS End-User License Agreement.