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A206380 Number of (n+1)X6 0..3 arrays with every 2X2 subblock having the same number of equal diagonal or antidiagonal elements, and new values 0..3 introduced in row major order 1
44585, 10690969, 2808967145, 748963157161, 200108001096137, 53482634218458697, 14294968502144130953, 3820826066766517546921, 1021249666781298003730505, 272964826866462882832853641 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 5 of A206383

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..72

FORMULA

Empirical: a(n) = 394*a(n-1) -38562*a(n-2) +1246392*a(n-3) +6334675*a(n-4) -1215511426*a(n-5) +25096715040*a(n-6) -111433495776*a(n-7) -2633554263696*a(n-8) +38447016473440*a(n-9) -124529929487104*a(n-10) -973109346072576*a(n-11) +8528195948079360*a(n-12) -13461810857735680*a(n-13) -67310021223342080*a(n-14) +238037998037753856*a(n-15) +44544280591749120*a(n-16) -947327372288188416*a(n-17) +643157082054918144*a(n-18) +987246769084563456*a(n-19) -892353207989698560*a(n-20)

EXAMPLE

Some solutions for n=4

..0..0..0..0..1..2....0..0..0..0..0..0....0..0..0..0..1..1....0..1..2..1..1..0

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

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

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

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

CROSSREFS

Sequence in context: A254994 A295480 A206166 * A204786 A248066 A252147

Adjacent sequences:  A206377 A206378 A206379 * A206381 A206382 A206383

KEYWORD

nonn

AUTHOR

R. H. Hardin Feb 07 2012

STATUS

approved

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Last modified June 18 20:04 EDT 2021. Contains 345121 sequences. (Running on oeis4.)