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A224619 Number of (n+4)X6 0..2 matrices with each 5X5 subblock idempotent 1
20465, 15354, 19596, 22081, 23453, 24252, 31702, 43635, 58076, 73708, 89988, 113491, 148896, 198454, 263524, 344683, 449230, 588930, 778104, 1032073, 1367122, 1806502, 2385414, 3153261, 4175034, 5531556, 7327326, 9701805, 12844004 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

Column 2 of A224625

LINKS

R. H. Hardin, Table of n, a(n) for n = 1..64

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

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

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

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

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

CROSSREFS

Sequence in context: A281658 A234304 A242619 * A186060 A253866 A253873

Adjacent sequences:  A224616 A224617 A224618 * A224620 A224621 A224622

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 12 2013

STATUS

approved

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Last modified June 28 01:48 EDT 2022. Contains 354903 sequences. (Running on oeis4.)