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 A224662 Number of n X n 0..5 matrices with each 2X2 subblock idempotent 0
 6, 24, 128, 222, 500, 956, 1876, 3538, 6622, 12200, 22274, 40302, 72418, 129332, 229780, 406378, 715800, 1256248, 2197512, 3832510, 6665570, 11563364, 20012598 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Column 5 of A224665 LINKS FORMULA Empirical: a(n) = 6*a(n-1) -12*a(n-2) +5*a(n-3) +12*a(n-4) -12*a(n-5) -3*a(n-6) +6*a(n-7) -a(n-9) for n>10 EXAMPLE Some solutions for n=3 ..0..0..0....1..1..4....1..0..5....1..1..3....1..0..2....1..0..2....1..0..0 ..0..0..0....0..0..0....1..0..1....0..0..0....1..0..1....1..0..1....1..0..1 ..2..1..1....0..0..0....0..0..1....5..1..1....2..0..1....4..0..1....3..0..1 CROSSREFS Sequence in context: A052557 A188232 A274072 * A200160 A219622 A052170 Adjacent sequences:  A224659 A224660 A224661 * A224663 A224664 A224665 KEYWORD nonn AUTHOR R. H. Hardin Apr 14 2013 STATUS approved

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Last modified January 19 09:16 EST 2022. Contains 350464 sequences. (Running on oeis4.)