A200454 - OEIS

%I #5 Mar 31 2012 12:36:39

%S 4,10,4,26,44,6,44,142,144,10,72,342,728,486,14,102,678,2334,3788,

%T 1582,22,142,1148,5720,16380,19802,5478,34,184,1832,12002,50852,

%U 115140,103726,18692,52,236,2744,22276,127988,451708,820650,548204,64782,80,290,3874

%N T(n,k)=Number of -k..k arrays x(0..n+1) of n+2 elements with zero sum and nonzero first and second differences

%C Table starts

%C ...4.....10.......26.........44..........72..........102...........142

%C ...4.....44......142........342.........678.........1148..........1832

%C ...6....144......728.......2334........5720........12002.........22276

%C ..10....486.....3788......16380.......50852.......127988........278906

%C ..14...1582....19802.....115140......451708......1375006.......3513884

%C ..22...5478...103726.....820650.....4062384.....14923636......44716536

%C ..34..18692...548204....5876818....36725772....163058296.....572857272

%C ..52..64782..2916664...42324384...334032710...1791564880....7380022092

%C ..80.223272.15576706..306098316..3050654456..19771609900...95496980144

%C .126.776430.83481240.2222013090.27965763262.219008350922.1240352594210

%H R. H. Hardin, <a href="/A200454/b200454.txt">Table of n, a(n) for n = 1..715</a>

%e Some solutions for n=4 k=3

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

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

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

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

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

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

%Y Column 1 is twice A077419(n+2)

%K nonn,tabl

%O 1,1

%A _R. H. Hardin_ Nov 18 2011