cp's OEIS Frontend

A187983 Number of nondecreasing arrangements of n numbers x(i) in -(n+2)..(n+2) with the sum of sign(x(i))*2^|x(i)| zero.

%I A187983 #14 Jun 15 2025 16:07:20
%S A187983 0,4,9,30,111,355,1257,4357,15146,53379,187699,663631,2352610,8356208,
%T A187983 29754352,106127185,379166226,1356700796,4860763378,17436188166,
%U A187983 62613987171,225072940410,809789751003,2915986488761,10508369260118,37896284981596,136756217644237,493817776063606
%N A187983 Number of nondecreasing arrangements of n numbers x(i) in -(n+2)..(n+2) with the sum of sign(x(i))*2^|x(i)| zero.
%e A187983 All solutions for n=3
%e A187983 .-2...-3...-4...-1...-1...-4...-5...-2...-3
%e A187983 .-2...-3....3...-1....0...-4....4....1....2
%e A187983 ..3....4....3....2....0....5....4....1....2
%Y A187983 Column 4 of A187988.
%K A187983 nonn
%O A187983 1,2
%A A187983 _R. H. Hardin_, Mar 18 2011
%E A187983 Terms from a(16) on by _R. J. Mathar_, May 17 2023