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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.

A264571 Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 with each element having directed index change 1,0 1,1 0,-1 or -1,1.

Table of values

n a(n)
1 1
2 4
3 10
4 44
5 143
6 633
7 2172
8 8409
9 32046
10 123607
11 467535
12 1782748
13 6811612
14 25977296
15 98955733
16 377295524
17 1439130735
18 5486977972
19 20918581591
20 79761954903
21 304138808396
22 1159628108611
23 4421450347014
24 16858598826709

List of values

[1, 4, 10, 44, 143, 633, 2172, 8409, 32046, 123607, 467535, 1782748, 6811612, 25977296, 98955733, 377295524, 1439130735, 5486977972, 20918581591, 79761954903, 304138808396, 1159628108611, 4421450347014, 16858598826709]

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

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