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A251508 Number of (n+1)X(1+1) 0..4 arrays with every 2X2 subblock summing to a prime 1
234, 2264, 21862, 211680, 2047194, 19818328, 191708742, 1855695600, 17952272890, 173762374600, 1681099972966, 16270774744064, 157421932250266, 1523571767403576, 14741276442715142, 142665595478323984 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A251515

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) +115*a(n-2) -138*a(n-3) -2996*a(n-4) +2512*a(n-5) +26576*a(n-6) -15680*a(n-7) -65856*a(n-8) +34560*a(n-9)

EXAMPLE

Some solutions for n=3

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

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

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

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

CROSSREFS

Sequence in context: A252777 A252771 A251515 * A185482 A036209 A077803

Adjacent sequences:  A251505 A251506 A251507 * A251509 A251510 A251511

KEYWORD

nonn

AUTHOR

R. H. Hardin, Dec 03 2014

STATUS

approved

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Last modified October 27 06:09 EDT 2020. Contains 338035 sequences. (Running on oeis4.)