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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.

A302474 Number of 4 X n 0..1 arrays with every element equal to 1, 2, 3 or 5 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.

Table of values

n a(n)
1 0
2 34
3 250
4 1401
5 10264
6 78679
7 584333
8 4330427
9 32116855
10 238854305
11 1774890111
12 13186901755
13 97987405188
14 728115173717
15 5410378555145
16 40202636764567
17 298731900955463
18 2219776401635593
19 16494405056538952
20 122564331015474402
21 910734015368035169
22 6767355923137558997

List of values

[0, 34, 250, 1401, 10264, 78679, 584333, 4330427, 32116855, 238854305, 1774890111, 13186901755, 97987405188, 728115173717, 5410378555145, 40202636764567, 298731900955463, 2219776401635593, 16494405056538952, 122564331015474402, 910734015368035169, 6767355923137558997]

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

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