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.

A151282 Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, -1), (-1, 0), (0, 1), (1, 1)}.

Table of values

n a(n)
0 1
1 2
2 6
3 18
4 58
5 190
6 638
7 2170
8 7474
9 25974
10 90982
11 320738
12 1137002
13 4049838
14 14485326
15 52001290
16 187292514
17 676546790
18 2450311862
19 8895769714
20 32366225562
21 117995832990
22 430960312862
23 1576675041434
24 5777325893266
25 21200338220630
26 77901645076998
27 286615385651970
28 1055762834791114
29 3893279267979662

List of values

[1, 2, 6, 18, 58, 190, 638, 2170, 7474, 25974, 90982, 320738, 1137002, 4049838, 14485326, 52001290, 187292514, 676546790, 2450311862, 8895769714, 32366225562, 117995832990, 430960312862, 1576675041434, 5777325893266, 21200338220630, 77901645076998, 286615385651970, 1055762834791114, 3893279267979662]

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

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