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.

A196804 Number of n X 3 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 4,2,3,0,1 for x=0,1,2,3,4.

Table of values

n a(n)
1 1
2 3
3 16
4 37
5 120
6 420
7 1468
8 4801
9 15885
10 53128
11 178165
12 594582
13 1983454
14 6622194
15 22119691
16 73864009
17 246623786
18 823483995
19 2749775102
20 9181948002
21 30659615818
22 102376096183
23 341847401583
24 1141474348346
25 3811532000911
26 12727199593820

List of values

[1, 3, 16, 37, 120, 420, 1468, 4801, 15885, 53128, 178165, 594582, 1983454, 6622194, 22119691, 73864009, 246623786, 823483995, 2749775102, 9181948002, 30659615818, 102376096183, 341847401583, 1141474348346, 3811532000911, 12727199593820]