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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.

A195638 Number of lower triangles of an n X n 0..n array with all row sums equal to the length of the row and all column sums equal to the length of the column.

Table of values

n a(n)
1 1
2 1
3 3
4 19
5 391
6 25532
7 5539434
8 4116290300
9 10699755803977
10 98834805799836193
11 3285452504354615242708
12 397045217438108647483964418
13 175907525023476787251523714204914
14 287726899459800056272961335544498108972
15 1747931723877860528675045077016711589788124993

List of values

[1, 1, 3, 19, 391, 25532, 5539434, 4116290300, 10699755803977, 98834805799836193, 3285452504354615242708, 397045217438108647483964418, 175907525023476787251523714204914, 287726899459800056272961335544498108972, 1747931723877860528675045077016711589788124993]

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

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