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.

A228750 Number of n X 4 binary arrays with top left element equal to 1 and no two ones adjacent horizontally or antidiagonally.

Table of values

n a(n)
1 3
2 20
3 126
4 780
5 4808
6 29608
7 182288
8 1122240
9 6908896
10 42533440
11 261849728
12 1612032128
13 9924194048
14 61096565760
15 376130326016
16 2315580595200
17 14255467112448
18 87761291061248
19 540287045521408
20 3326182739886080

List of values

[3, 20, 126, 780, 4808, 29608, 182288, 1122240, 6908896, 42533440, 261849728, 1612032128, 9924194048, 61096565760, 376130326016, 2315580595200, 14255467112448, 87761291061248, 540287045521408, 3326182739886080]

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

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