cp's OEIS Frontend

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.

A264552 Number of (3+1)X(n+1) arrays of permutations of 0..n*4+3 with each element having directed index change -1,1 -1,2 1,0 or 0,-1.

Table of values

n a(n)
1 0
2 5
3 16
4 36
5 172
6 764
7 2728
8 9880
9 38818
10 150536
11 567680
12 2152907
13 8249172
14 31505782
15 119890865
16 456906182
17 1743546208
18 6648727988
19 25342679205
20 96627142521
21 368474752553
22 1404944654910
23 5356632127953
24 20424348993729

List of values

[0, 5, 16, 36, 172, 764, 2728, 9880, 38818, 150536, 567680, 2152907, 8249172, 31505782, 119890865, 456906182, 1743546208, 6648727988, 25342679205, 96627142521, 368474752553, 1404944654910, 5356632127953, 20424348993729]

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

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