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A202664 T(n,k)=Number of -k..k arrays of n elements with first through fourth differences also in -k..k 10

%I #5 Mar 31 2012 12:36:50

%S 3,5,7,7,19,13,9,37,57,19,11,61,153,127,19,13,91,323,475,213,23,15,

%T 127,587,1279,1101,363,23,17,169,967,2833,3785,2591,613,23,19,217,

%U 1483,5509,10205,11413,6055,1055,23,21,271,2157,9739,23425,37505,34171,14199,1815

%N T(n,k)=Number of -k..k arrays of n elements with first through fourth differences also in -k..k

%C Table starts

%C ..3....5.....7......9......11.......13........15........17.........19

%C ..7...19....37.....61......91......127.......169.......217........271

%C .13...57...153....323.....587......967......1483......2157.......3009

%C .19..127...475...1279....2833.....5509......9739.....16039......25003

%C .19..213..1101...3785...10205....23425.....47713.....89007.....154971

%C .23..363..2591..11413...37505...101567....238453....503849.....979919

%C .23..613..6055..34171..136999...438177...1186107...2839237....6169921

%C .23.1055.14199.102705..501903..1895197...5914721..16039207...38941497

%C .23.1815.33289.308785.1838983..8198571..29498237..90622033..245814423

%C .23.3159.78119.928115.6737379.35463355.147102833.511970795.1551547261

%H R. H. Hardin, <a href="/A202664/b202664.txt">Table of n, a(n) for n = 1..1389</a>

%e Some solutions for n=5 k=7

%e .-2....5....2....0....4....6....7...-5...-7....6...-1....5...-1...-1...-2...-2

%e .-4....2....0...-6....1....5....3...-3...-6....3....2....7...-1...-3....0...-5

%e .-5....2...-5...-7...-3....3....0...-4....0...-3....6....5...-2...-7....3...-4

%e .-5....0...-7...-4...-3....3....0...-2....5...-5....6....3...-3...-6....5....0

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

%Y Row 2 is A003215

%Y Row 3 is A007202

%Y Row 4 is A202125

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_ Dec 22 2011

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Last modified September 5 00:56 EDT 2024. Contains 375685 sequences. (Running on oeis4.)