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.

A005769 Number of convex polygons of length 2n on square lattice whose leftmost bottom vertex is strictly to the right of the rightmost top vertex.

Table of values

n a(n)
6 1
7 13
8 110
9 758
10 4617
11 25895
12 136949
13 693369
14 3395324
15 16197548
16 75675657
17 347624505
18 1574756959
19 7051383905
20 31266981002
21 137492793602
22 600295660953
23 2604690331787
24 11240698270037
25 48279130088017
26 206486210282936
27 879807455701208
28 3736101981855305

List of values

[1, 13, 110, 758, 4617, 25895, 136949, 693369, 3395324, 16197548, 75675657, 347624505, 1574756959, 7051383905, 31266981002, 137492793602, 600295660953, 2604690331787, 11240698270037, 48279130088017, 206486210282936, 879807455701208, 3736101981855305]

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

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