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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.

A264359 Number of (n+1)X(3+1) arrays of permutations of 0..n*4+3 with each element having directed index change 0,0 0,2 1,0 or -1,-2.

Table of values

n a(n)
1 9
2 36
3 169
4 784
5 3600
6 16641
7 76729
8 354025
9 1633284
10 7535025
11 34762816
12 160376896
13 739894401
14 3413480625
15 15747991081
16 72652889764
17 335181944601
18 1546351938576
19 7134048689296
20 32912721515521
21 151841862142569
22 700517916355401

List of values

[9, 36, 169, 784, 3600, 16641, 76729, 354025, 1633284, 7535025, 34762816, 160376896, 739894401, 3413480625, 15747991081, 72652889764, 335181944601, 1546351938576, 7134048689296, 32912721515521, 151841862142569, 700517916355401]

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

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