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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.

A222440 Number of n X 4 0..3 arrays with entries increasing mod 4 by 0, 1 or 2 rightwards and downwards, starting with upper left zero.

Table of values

n a(n)
1 27
2 1029
3 39285
4 1500183
5 57289767
6 2187822609
7 83550197745
8 3190677470643
9 121847980727187
10 4653221950068669
11 177700725073710285
12 6786168386579878383
13 259155281174281941087
14 9896815984320245625609
15 377947021506548282896905

List of values

[27, 1029, 39285, 1500183, 57289767, 2187822609, 83550197745, 3190677470643, 121847980727187, 4653221950068669, 177700725073710285, 6786168386579878383, 259155281174281941087, 9896815984320245625609, 377947021506548282896905]

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

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