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A188240 Number of nondecreasing arrangements of 7 numbers in -(n+5)..(n+5) with sum zero and not more than two numbers equal 1

%I

%S 1082,2395,4818,8964,15696,26123,41748,64370,96346,140463,200176,

%T 279520,383424,517461,688344,903624,1172142,1503785,1910034,2403502,

%U 2998722,3711609,4560190,5564140,6745632,8128589,9739838,11608268,13765902

%N Number of nondecreasing arrangements of 7 numbers in -(n+5)..(n+5) with sum zero and not more than two numbers equal

%C Row 7 of A188236

%H R. H. Hardin, <a href="/A188240/b188240.txt">Table of n, a(n) for n = 1..200</a>

%F Empirical: a(n)=2*a(n-1)-a(n-3)-a(n-5)+a(n-6)-2*a(n-7)+2*a(n-8)+a(n-9)-a(n-13)-2*a(n-14)+2*a(n-15)-a(n-16)+a(n-17)+a(n-19)-2*a(n-21)+a(n-22)

%e Some solutions for n=4

%e .-6...-7...-9...-8...-7...-5...-8...-9...-4...-8...-6...-6...-6...-8...-9...-7

%e .-4...-5...-9...-6...-6...-5...-5...-8...-3...-7...-6...-5...-6...-8...-5...-7

%e .-2...-2....1...-3...-2...-1...-5...-8...-3...-3....0...-5...-3...-1...-1...-4

%e .-1....0....3...-1...-1...-1....0....3...-1...-1....0....1....1...-1....0...-1

%e ..1....3....3....1...-1....1....5....6....2....6....1....2....1....4....2....6

%e ..5....3....5....8....8....5....6....8....3....6....3....5....5....6....6....6

%e ..7....8....6....9....9....6....7....8....6....7....8....8....8....8....7....7

%K nonn

%O 1,1

%A _R. H. Hardin_ Mar 24 2011

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Last modified October 3 04:46 EDT 2022. Contains 357230 sequences. (Running on oeis4.)