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.

A188447 Number of (5*n) X n binary arrays with nonzero rows in decreasing order and 5 ones in every column.

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%I A188447 #14 Dec 17 2018 02:29:55
%S A188447 1,0,0,0,205,250735,425677958,1184910460297,5319037255069867,
%T A188447 37061043058189077109,385952934535384722609921,
%U A188447 5808709067366205646755198576,122705633165265276505954301866183,3547341635706102198376777462145800378,137294155514669462885867305539515979061866
%N A188447 Number of (5*n) X n binary arrays with nonzero rows in decreasing order and 5 ones in every column.
%H A188447 Andrew Howroyd, <a href="/A188447/b188447.txt">Table of n, a(n) for n = 0..40</a>
%e A188447 Some solutions for 20 X 4:
%e A188447   1 1 1 1     1 1 1 0     1 1 1 1     1 1 1 0     1 1 0 1
%e A188447   1 1 1 0     1 1 0 1     1 1 0 1     1 1 0 1     1 0 1 1
%e A188447   1 1 0 1     1 0 1 1     1 1 0 0     1 0 1 1     1 0 1 0
%e A188447   1 0 1 1     1 0 1 0     1 0 1 0     1 0 1 0     1 0 0 1
%e A188447   1 0 0 0     1 0 0 1     1 0 0 1     1 0 0 0     1 0 0 0
%e A188447   0 1 1 0     0 1 1 0     0 1 1 0     0 1 1 1     0 1 1 1
%e A188447   0 1 0 1     0 1 0 1     0 1 0 1     0 1 1 0     0 1 1 0
%e A188447   0 0 1 1     0 1 0 0     0 0 1 1     0 1 0 1     0 1 0 1
%e A188447   0 0 0 0     0 0 1 1     0 0 1 0     0 0 0 1     0 1 0 0
%e A188447   0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0     0 0 1 0
%e A188447   0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0
%e A188447   0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0
%e A188447   0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0
%e A188447   0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0
%e A188447   0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0
%e A188447   0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0
%e A188447   0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0
%e A188447   0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0
%e A188447   0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0
%e A188447   0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0     0 0 0 0
%Y A188447 Row 5 of A188445.
%K A188447 nonn
%O A188447 0,5
%A A188447 _R. H. Hardin_, Mar 31 2011
%E A188447 a(0)=1 prepended and terms a(9) and beyond from _Andrew Howroyd_, Dec 15 2018