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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.

A151344 Number of walks within N^2 (the first quadrant of Z^2) starting and ending at (0,0) and consisting of 2 n steps taken from {(-1, -1), (-1, 0), (-1, 1), (1, -1), (1, 0)}.

Table of values

n a(n)
0 1
1 1
2 5
3 35
4 313
5 3253
6 37540
7 467990
8 6190709
9 85835624
10 1236484572
11 18384929389
12 280749914660
13 4386014526625
14 69882361534195
15 1132723613672240
16 18640032332057095
17 310881221313870479
18 5247411904749163561
19 89530524469245596005
20 1542486243771208605759
21 26810622290131017450845

List of values

[1, 1, 5, 35, 313, 3253, 37540, 467990, 6190709, 85835624, 1236484572, 18384929389, 280749914660, 4386014526625, 69882361534195, 1132723613672240, 18640032332057095, 310881221313870479, 5247411904749163561, 89530524469245596005, 1542486243771208605759, 26810622290131017450845]

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

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