cp's OEIS Frontend

A188978 Number of nX4 array permutations with each element moved but moved no more than a city block distance of two.

%I A188978 #7 Jul 22 2025 11:30:17
%S A188978 4,900,295264,54113236,10523263424,2184414516364,446454227170968,
%T A188978 90637093836201284,18447462299508458652,3757678170703167716673,
%U A188978 765103415743509162801632,155767055441358236289145024
%N A188978 Number of nX4 array permutations with each element moved but moved no more than a city block distance of two.
%C A188978 Column 4 of A188981
%H A188978 R. H. Hardin, <a href="/A188978/b188978.txt">Table of n, a(n) for n = 1..52</a>
%e A188978 Some solutions for 3X4
%e A188978 ..2..4..0.11....2..3.10.11....1..6..3.11....2..4..7.11....2..3..0.11
%e A188978 ..5..8..9..3....8..1..5..6....9..7..4..2....9.10..3..5....1..8..7..6
%e A188978 .10..1..7..6....0..4..7..9....0..8..5.10....0..1..8..6....9..4..5.10
%K A188978 nonn
%O A188978 1,1
%A A188978 _R. H. Hardin_ Apr 14 2011