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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.

A383480 Number of lattice paths from (0,0) to (n,n) using steps (1,0),(4,0),(0,1).

Table of values

n a(n)
0 1
1 2
2 6
3 20
4 75
5 294
6 1176
7 4752
8 19350
9 79310
10 326898
11 1353768
12 5628441
13 23478700
14 98217840
15 411879264
16 1730924700
17 7287941340
18 30736775190
19 129825892000
20 549096132585
21 2325216522420
22 9857299586700
23 41830206233400
24 177673556967075
25 755307883986084
26 3213402383779812

List of values

[1, 2, 6, 20, 75, 294, 1176, 4752, 19350, 79310, 326898, 1353768, 5628441, 23478700, 98217840, 411879264, 1730924700, 7287941340, 30736775190, 129825892000, 549096132585, 2325216522420, 9857299586700, 41830206233400, 177673556967075, 755307883986084, 3213402383779812]

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

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