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A211502 Number of -3..3 arrays x(i) of n+1 elements i=1..n+1 with x(i)+x(j), x(i+1)+x(j+1), -(x(i)+x(j+1)), and -(x(i+1)+x(j)) having three or four distinct values for every i<=n and j<=n 1
38, 208, 1104, 5816, 30248, 155984, 798008, 4055448, 20491120, 103013824, 515604792, 2570696888, 12773241696, 63275422112, 312609173352, 1540740611240, 7577596595792, 37196939930000, 182282328074520, 891911689935896 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..210

FORMULA

Empirical: a(n) = 10*a(n-1) +37*a(n-2) -550*a(n-3) -649*a(n-4) +13442*a(n-5) +11131*a(n-6) -183874*a(n-7) -197258*a(n-8) +1418860*a(n-9) +2192568*a(n-10) -5278112*a(n-11) -11467160*a(n-12) +5231288*a(n-13) +19433444*a(n-14) -4017688*a(n-15) -17551936*a(n-16) +5387696*a(n-17) +8469936*a(n-18) -4963520*a(n-19) -969600*a(n-20) +1662208*a(n-21) -604416*a(n-22) +97792*a(n-23) -6144*a(n-24)

EXAMPLE

Some solutions for n=5

..0...-3....1...-3....1....0...-1...-2....1....0....0...-3...-1...-2....1...-1

.-2....0....0....3....2....3....0....0...-2....3...-2...-1...-3....1....2....2

..3...-3....2....2....0...-3...-1...-3....1....2....0...-3....0....3....0...-2

..2...-2...-1...-3....2....0....1....0....2....0....3...-2...-3....1...-2....1

.-2....2....0....0...-1....1...-2...-2....3...-2....0....1...-2....0....2....2

..1...-2....3...-3....0....0....2....3....2....3...-2....3....3...-3...-2....3

CROSSREFS

Sequence in context: A191698 A124238 A020870 * A259518 A209250 A165068

Adjacent sequences:  A211499 A211500 A211501 * A211503 A211504 A211505

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 13 2012

STATUS

approved

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Last modified August 11 00:55 EDT 2022. Contains 356046 sequences. (Running on oeis4.)