cp's OEIS Frontend

A193985 Number of ways to arrange 7 nonattacking triangular rooks on an nXnXn triangular grid.

%I A193985 #9 Jul 22 2025 12:32:04
%S A193985 0,0,0,0,0,0,0,0,0,28,4842,104448,1127473,8147469,44813100,201616740,
%T A193985 776296572,2638333236,8091512680,22767562704,59525327634,146063694310,
%U A193985 339101167392,749761416480,1587403977944,3233026755180,6358705091310
%N A193985 Number of ways to arrange 7 nonattacking triangular rooks on an nXnXn triangular grid.
%C A193985 Column 7 of A193986
%H A193985 R. H. Hardin, <a href="/A193985/b193985.txt">Table of n, a(n) for n = 1..30</a>
%e A193985 Some solutions for 10X10X10
%e A193985 ...........0....................0....................0
%e A193985 ..........0.0..................0.0..................0.0
%e A193985 .........0.0.0................0.0.0................0.0.0
%e A193985 ........1.0.0.0..............0.1.0.0..............0.0.0.1
%e A193985 .......0.0.0.0.1............0.0.0.0.1............0.0.1.0.0
%e A193985 ......0.0.0.1.0.0..........1.0.0.0.0.0..........0.1.0.0.0.0
%e A193985 .....0.1.0.0.0.0.0........0.0.1.0.0.0.0........1.0.0.0.0.0.0
%e A193985 ....0.0.0.0.0.0.1.0......0.0.0.0.0.0.1.0......0.0.0.0.0.0.1.0
%e A193985 ...0.0.1.0.0.0.0.0.0....0.0.0.0.0.1.0.0.0....0.0.0.0.0.1.0.0.0
%e A193985 ..0.0.0.0.0.1.0.0.0.0..0.0.0.1.0.0.0.0.0.0..0.0.0.0.1.0.0.0.0.0
%K A193985 nonn
%O A193985 1,10
%A A193985 _R. H. Hardin_ Aug 10 2011