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A224583 Number of (n+6)X9 0..1 matrices with each 7X7 subblock idempotent 1
125525, 22928, 21966, 24293, 26294, 27945, 29066, 30031, 35282, 44719, 57279, 72507, 89253, 106861, 125137, 148577, 181148, 226344, 286350, 362933, 456996, 569113, 704154, 871995, 1084810, 1357286, 1706012, 2148697, 2703197, 3392851 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 3 of A224588

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) -2*a(n-2) +2*a(n-3) -2*a(n-4) +3*a(n-5) -3*a(n-6) +3*a(n-7) -2*a(n-8) +a(n-9) -a(n-10) -2*a(n-13) +2*a(n-14) -2*a(n-15) +2*a(n-16) -2*a(n-17) +3*a(n-18) -2*a(n-19) +2*a(n-20) -a(n-21) +a(n-22) -a(n-23) +a(n-24) -a(n-25) for n>33

EXAMPLE

Some solutions for n=2

..1..1..1..0..1..0..0..0..1....1..0..0..0..0..0..0..0..0

..0..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0

..0..0..0..0..0..0..0..0..0....0..1..0..0..1..0..0..0..1

..0..0..0..0..0..0..0..0..0....0..1..0..0..1..0..0..0..1

..0..0..0..0..0..0..0..0..0....0..1..0..0..1..0..0..0..1

..0..0..0..0..1..1..1..1..0....0..0..0..0..0..0..0..0..0

..0..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0

..0..0..0..0..0..0..0..0..0....0..0..0..0..0..0..0..0..0

CROSSREFS

Sequence in context: A237728 A048936 A237066 * A252208 A175691 A133220

Adjacent sequences:  A224580 A224581 A224582 * A224584 A224585 A224586

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 11 2013

STATUS

approved

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Last modified April 19 21:57 EDT 2021. Contains 343117 sequences. (Running on oeis4.)