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A224581 Number of (n+6)X7 0..1 matrices with each 7X7 subblock idempotent 1
2185738, 164935, 125525, 122508, 128620, 138581, 146715, 156428, 171787, 199628, 251449, 337387, 463685, 642049, 872565, 1156493, 1513357, 1983382, 2631002, 3556586, 4890506, 6786490, 9424850, 13019794, 17851883, 24336233, 33091332 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 1 of A224588

LINKS

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

FORMULA

Empirical: a(n) = a(n-3) +a(n-5) +a(n-7) +2*a(n-8) +3*a(n-9) +2*a(n-10) -2*a(n-13) -2*a(n-14) -3*a(n-15) -2*a(n-16) -4*a(n-17) -3*a(n-18) -2*a(n-19) +a(n-21) +2*a(n-22) +2*a(n-23) +a(n-24) +a(n-25) +a(n-26) +a(n-27) for n>39

EXAMPLE

Some solutions for n=2

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

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

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

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

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

CROSSREFS

Sequence in context: A105711 A250491 A224580 * A224588 A234332 A251342

Adjacent sequences:  A224578 A224579 A224580 * A224582 A224583 A224584

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 11 2013

STATUS

approved

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Last modified May 11 13:41 EDT 2021. Contains 343791 sequences. (Running on oeis4.)