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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.

A194780 Number of lower triangles of a (2n)X(2n) 0..n array with new values introduced in row major order 0..n and no element unequal to more than one horizontal or vertical neighbor.

Table of values

n a(n)
1 3
2 17
3 105
4 672
5 4490
6 31466
7 231445
8 1784788
9 14404218
10 121421075
11 1066906979
12 9753108510
13 92586250999
14 911156724048

List of values

[3, 17, 105, 672, 4490, 31466, 231445, 1784788, 14404218, 121421075, 1066906979, 9753108510, 92586250999, 911156724048]

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

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