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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.

A188406 Number of (5*n) X n binary arrays with rows in nonincreasing order, 5 ones in every column and no more than 2 ones in any row.

Table of values

n a(n)
0 1
1 1
2 6
3 69
4 1620
5 62781
6 3710272
7 313568636
8 36218801244
9 5518184697792
10 1078258692423672
11 264082675302603684
12 79537577428138854144
13 28988656113108616134732
14 12610397520409429024276176
15 6469939930732195901177163384
16 3874562148530193751600746715440
17 2683567291732998871830525552934800

List of values

[1, 1, 6, 69, 1620, 62781, 3710272, 313568636, 36218801244, 5518184697792, 1078258692423672, 264082675302603684, 79537577428138854144, 28988656113108616134732, 12610397520409429024276176, 6469939930732195901177163384, 3874562148530193751600746715440, 2683567291732998871830525552934800]

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

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