cp's OEIS Frontend

A189503 Number of arrangements of 7 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero.

%I A189503 #7 Jul 22 2025 11:47:51
%S A189503 40,1892,27508,182634,787412,2642358,7269852,17692662,38791846,
%T A189503 78583484,149461616,269390980,462294730,765448244,1224516760,
%U A189503 1898713570,2870678078,4243248920,6141093956,8731426052,12179866066,16758644852
%N A189503 Number of arrangements of 7 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero.
%C A189503 Row 6 of A189498
%H A189503 R. H. Hardin, <a href="/A189503/b189503.txt">Table of n, a(n) for n = 1..143</a>
%e A189503 Some solutions for n=5
%e A189503 ..2...-3...-3...-2...-1...-3...-1....1....2...-2...-2...-4...-1....1....1....2
%e A189503 .-5...-5...-4...-5...-5...-4...-5...-5...-4...-5...-4...-4...-5...-4...-4...-5
%e A189503 .-3....2....3...-3...-2....2....2...-2...-5...-2...-4....4....4...-5....3...-4
%e A189503 .-3...-4....2....5...-2...-4....3....2....5...-5....5....2...-5...-3....5....2
%e A189503 ..2...-4....1...-4....2...-2....2....5....2....4...-5...-3...-2....5....1....2
%e A189503 ..5...-1....4...-2...-3...-1....1...-5....3...-5...-3....4...-3....3...-3....4
%e A189503 ..5....1...-5...-4....5....3....4...-3....4...-3...-5....5...-2....5....4....3
%K A189503 nonn
%O A189503 1,1
%A A189503 _R. H. Hardin_ Apr 23 2011