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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.

A151265 Number of walks within N^2 (the first quadrant of Z^2) starting at (0,0) and consisting of n steps taken from {(-1, 0), (0, -1), (1, 1)}.

Table of values

n a(n)
0 1
1 1
2 3
3 7
4 17
5 47
6 125
7 333
8 939
9 2597
10 7183
11 20505
12 57859
13 163201
14 469795
15 1341775
16 3830529
17 11092823
18 31940165
19 91927379
20 267406401
21 774447755
22 2242022721
23 6544458687
24 19036737381
25 55354815639
26 162028272261
27 472921269031
28 1379896701413
29 4048204328607
30 11848014062621
31 34665885291485

List of values

[1, 1, 3, 7, 17, 47, 125, 333, 939, 2597, 7183, 20505, 57859, 163201, 469795, 1341775, 3830529, 11092823, 31940165, 91927379, 267406401, 774447755, 2242022721, 6544458687, 19036737381, 55354815639, 162028272261, 472921269031, 1379896701413, 4048204328607, 11848014062621, 34665885291485]

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

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