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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.

A191678 Number of lattice paths from (0,0) to (n,n) using steps (1,0), (1,1), (0,2), (2,2).

Table of values

n a(n)
0 1
1 1
2 5
3 15
4 62
5 233
6 937
7 3729
8 15121
9 61492
10 251942
11 1036215
12 4279754
13 17731181
14 73670725
15 306823695
16 1280574706
17 5354602495
18 22426876445
19 94070238840
20 395106054632
21 1661489413472
22 6994494531010
23 29474635716345
24 124319047552309
25 524797934104312
26 2217091297558466
27 9373180869094923

List of values

[1, 1, 5, 15, 62, 233, 937, 3729, 15121, 61492, 251942, 1036215, 4279754, 17731181, 73670725, 306823695, 1280574706, 5354602495, 22426876445, 94070238840, 395106054632, 1661489413472, 6994494531010, 29474635716345, 124319047552309, 524797934104312, 2217091297558466, 9373180869094923]

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

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