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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.

A196310 Number of nX4 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 2,0,4,1,3 for x=0,1,2,3,4.

Table of values

n a(n)
1 5
2 17
3 50
4 335
5 866
6 2942
7 13277
8 56237
9 228881
10 862148
11 3323631
12 13251496
13 53662892
14 215087507
15 848846709
16 3350015319
17 13308176712
18 53085757815
19 211514954392
20 840367835992
21 3336205123509
22 13258112907409
23 52741016443951

List of values

[5, 17, 50, 335, 866, 2942, 13277, 56237, 228881, 862148, 3323631, 13251496, 53662892, 215087507, 848846709, 3350015319, 13308176712, 53085757815, 211514954392, 840367835992, 3336205123509, 13258112907409, 52741016443951]

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

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