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A224803 Number of (n+2)X3 0..3 matrices with each 3X3 subblock having the same population 1
262144, 1048576, 4194304, 16777216, 78118912, 363741184, 1693669888, 8752522240, 45231155200, 233744896000, 1291061094400, 7131016668160, 39387290765824, 226173622168576, 1298756689537024, 7457849958117376 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A224806

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..209

FORMULA

Empirical: a(n) = 10*a(n-1) -27*a(n-2) +252*a(n-3) -2340*a(n-4) +6318*a(n-5) -23427*a(n-6) +192150*a(n-7) -518805*a(n-8) +1061424*a(n-9) -7155540*a(n-10) +19319958*a(n-11) -25759944*a(n-12) +128799720*a(n-13) -347759244*a(n-14) +343901376*a(n-15) -1120618800*a(n-16) +3025670760*a(n-17) -2459272752*a(n-18) +4421589120*a(n-19) -11938290624*a(n-20) +8571080448*a(n-21) -6122200320*a(n-22) +16529940864*a(n-23) -11019960576*a(n-24)

EXAMPLE

Some solutions for n=2

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

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

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

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

CROSSREFS

Sequence in context: A069279 A068961 A224806 * A223336 A250868 A250861

Adjacent sequences:  A224800 A224801 A224802 * A224804 A224805 A224806

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 18 2013

STATUS

approved

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Last modified May 21 00:36 EDT 2022. Contains 353886 sequences. (Running on oeis4.)