A224684 - OEIS

A224684

Number of (n+4)X6 0..1 matrices with each 5X5 subblock idempotent

2351, 1312, 1494, 1720, 1938, 2110, 2591, 3332, 4377, 5599, 6968, 8749, 11314, 14818, 19530, 25558, 33366, 43649, 57438, 75842, 100289, 132470, 174892, 231022, 305587, 404481, 535530, 708936, 938459, 1242445, 1645315, 2179125, 2886344, 3823000

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OFFSET

1,1

COMMENTS

Column 2 of A224690

LINKS

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

FORMULA

Empirical: a(n) = 2*a(n-1) -a(n-2) +a(n-3) -a(n-4) -a(n-7) +a(n-8) -a(n-9) +a(n-10) +a(n-12) -a(n-13) for n>18

EXAMPLE

Some solutions for n=2

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

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

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

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

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

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

CROSSREFS

Sequence in context: A045306 A351229 A264943 * A198047 A179137 A003552

Adjacent sequences: A224681 A224682 A224683 * A224685 A224686 A224687

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 15 2013

STATUS

approved