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.
%I A189501 #7 Jul 22 2025 11:47:36 %S A189501 12,136,928,3388,9394,22088,45892,86416,152136,251964,400562,608572, %T A189501 895302,1288110,1800136,2460254,3306706,4375254,5709802,7332744, %U A189501 9299616,11690792,14567750,17952362,21909788,26581910,32027018,38302012,45552824 %N A189501 Number of arrangements of 5 nonzero numbers x(i) in -n..n with the sum of floor(x(i)/x(i+1)) equal to zero. %C A189501 Row 4 of A189498 %H A189501 R. H. Hardin, <a href="/A189501/b189501.txt">Table of n, a(n) for n = 1..200</a> %e A189501 Some solutions for n=5 %e A189501 ..4...-1...-2....5...-4....2....2...-1...-4...-1....2...-3...-5...-1....5....1 %e A189501 ..4...-2....2....2....3...-5...-5....3...-1....5...-2....5....4....3....5...-4 %e A189501 .-5....3....3....2....2....5...-5....5....4....3...-5....3...-4...-3....2....4 %e A189501 .-3....5....5...-5...-2...-4....4....2...-2....2....3...-2...-4...-4...-1....2 %e A189501 ..3....4....3....4...-1...-1....2...-3....2...-2....1...-1...-2...-2....2....3 %K A189501 nonn %O A189501 1,1 %A A189501 _R. H. Hardin_ Apr 23 2011