A224573 - OEIS

A224573

Number of (n+5)X9 0..1 matrices with each 6X6 subblock idempotent

18868, 6411, 6659, 7394, 8143, 8714, 9164, 10807, 13624, 17332, 21731, 26592, 31785, 38491, 47899, 60907, 78205, 100219, 127312, 161005, 203975, 259809, 332836, 427756, 549639, 705073, 903350, 1157341, 1484238, 1905898, 2449315, 3148048

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OFFSET

1,1

COMMENTS

Column 4 of A224577

LINKS

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

FORMULA

Empirical: a(n) = 3*a(n-1) -4*a(n-2) +4*a(n-3) -3*a(n-4) +a(n-5) +2*a(n-6) -5*a(n-7) +6*a(n-8) -6*a(n-9) +4*a(n-10) -a(n-11) -a(n-12) +2*a(n-13) -2*a(n-14) +2*a(n-15) -a(n-16) for n>20

EXAMPLE

Some solutions for n=2

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

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

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

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

CROSSREFS

Sequence in context: A330839 A243134 A212077 * A342080 A251015 A277787

Adjacent sequences: A224570 A224571 A224572 * A224574 A224575 A224576

KEYWORD

nonn

AUTHOR

R. H. Hardin Apr 10 2013

STATUS

approved