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A203652 1/25 the number of (n+1)X5 0..4 arrays with every 2X2 subblock having equal diagonal elements or equal antidiagonal elements 1
6561, 519445, 44577561, 3906948333, 343812029649, 30292030417413, 2669260624372937, 235230466316286557, 20729666228601067777, 1826821038860074533877, 160989718241260912957305 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 4 of A203656

LINKS

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

FORMULA

Empirical: a(n) = 69*a(n-1) +2528*a(n-2) -75120*a(n-3) +59456*a(n-4) +1531904*a(n-5) -345088*a(n-6) -1646592*a(n-7)

EXAMPLE

Some solutions for n=4

..0..2..2..0..0....4..1..0..1..1....0..3..2..3..4....1..2..4..4..4

..4..0..2..2..0....0..4..1..3..1....4..0..3..3..3....4..1..2..4..2

..3..4..0..2..2....0..0..4..1..3....2..4..0..3..1....1..3..1..2..0

..0..3..4..0..2....2..0..0..4..1....3..2..4..0..3....3..3..3..1..2

..3..0..3..4..0....3..2..0..0..4....4..3..2..4..0....2..3..1..3..1

CROSSREFS

Sequence in context: A017632 A209510 A016760 * A016772 A059980 A038684

Adjacent sequences:  A203649 A203650 A203651 * A203653 A203654 A203655

KEYWORD

nonn

AUTHOR

R. H. Hardin Jan 04 2012

STATUS

approved

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Last modified May 26 13:59 EDT 2022. Contains 354092 sequences. (Running on oeis4.)