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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
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%I #8 May 17 2023 05:02:49

%S 0,4,9,30,111,355,1257,4357,15146,53379,187699,663631,2352610,8356208,

%T 29754352,106127185,379166226,1356700796,4860763378,17436188166,

%U 62613987171,225072940410,809789751003,2915986488761,10508369260118,37896284981596,136756217644237,493817776063606

%N 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

%C Column 4 of A187988

%e All solutions for n=3

%e .-2...-3...-4...-1...-1...-4...-5...-2...-3

%e .-2...-3....3...-1....0...-4....4....1....2

%e ..3....4....3....2....0....5....4....1....2

%K nonn

%O 1,2

%A _R. H. Hardin_ Mar 18 2011

%E Terms from a(16) on by _R. J. Mathar_, May 17 2023