cp's OEIS Frontend

A202802 T(n,k) = Number of n X k binary arrays with every one adjacent to another one horizontally or vertically.

%I A202802 #7 Oct 14 2023 11:34:16
%S A202802 1,2,2,4,10,4,7,36,36,7,12,126,250,126,12,21,454,1718,1718,454,21,37,
%T A202802 1632,11988,22946,11988,1632,37,65,5854,83518,311144,311144,83518,
%U A202802 5854,65,114,21010,581518,4217066,8222576,4217066,581518,21010,114,200,75412
%N A202802 T(n,k) = Number of n X k binary arrays with every one adjacent to another one horizontally or vertically.
%C A202802 Table starts
%C A202802 ...1......2.........4............7..............12................21
%C A202802 ...2.....10........36..........126.............454..............1632
%C A202802 ...4.....36.......250.........1718...........11988.............83518
%C A202802 ...7....126......1718........22946..........311144...........4217066
%C A202802 ..12....454.....11988.......311144.........8222576.........217145076
%C A202802 ..21...1632.....83518......4217066.......217145076.......11168045764
%C A202802 ..37...5854....581518.....57127796......5730640104......573985849362
%C A202802 ..65..21010...4049700....773948962....151245101550....29502860015392
%C A202802 .114..75412..28202318..10485233258...3991784606164..1516477156642474
%C A202802 .200.270662.196400270.142050385280.105354316048660.77948189988273490
%H A202802 R. H. Hardin, <a href="/A202802/b202802.txt">Table of n, a(n) for n = 1..420</a>
%e A202802 Some solutions for n=5, k=3
%e A202802 ..0..0..0....0..1..0....0..0..0....0..0..0....1..1..1....1..1..0....0..1..1
%e A202802 ..1..0..0....0..1..0....0..0..0....1..1..1....1..1..1....0..1..1....1..1..1
%e A202802 ..1..1..0....1..0..0....1..1..1....1..0..1....0..0..0....1..1..0....0..1..0
%e A202802 ..1..1..1....1..1..1....1..0..1....1..0..0....1..1..1....1..1..0....0..0..0
%e A202802 ..1..1..0....0..0..1....1..0..0....1..1..0....0..0..1....0..0..0....1..1..1
%Y A202802 Column 1 is A005251(n+2).
%Y A202802 Diagonal is A134262.
%K A202802 nonn,tabl
%O A202802 1,2
%A A202802 _R. H. Hardin_, Dec 24 2011