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 A224598 Number of (n+2)X(n+2) 0..2 matrices with each 3X3 subblock idempotent 0
 122, 272, 482, 666, 1202, 2092, 3308, 5398, 8876, 14232, 22734, 36346, 57712, 91204, 143828, 226126, 354436, 554296, 865004, 1347042, 2093774, 3248860, 5032926, 7784734, 12023856, 18546144 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS Diagonal of A224606 LINKS Table of n, a(n) for n=1..26. Christian Ballot, Clark Kimberling, and Peter J. C. Moses, Linear Recurrences Originating From Polynomial Trees, Fibonacci Quart. 55 (2017), no. 5, 15-27. Mentions this sequence. FORMULA Empirical: a(n) = 6*a(n-1) -15*a(n-2) +23*a(n-3) -30*a(n-4) +36*a(n-5) -34*a(n-6) +27*a(n-7) -21*a(n-8) +13*a(n-9) -6*a(n-10) +3*a(n-11) -a(n-12) for n>14 EXAMPLE Some solutions for n=3 ..1..0..0..0..0....0..1..0..0..2....1..1..1..0..2....1..1..1..0..1 ..1..0..0..0..0....0..1..0..0..1....0..0..0..0..0....0..0..0..0..0 ..1..0..0..0..0....0..1..0..0..1....0..0..0..0..0....0..0..0..0..0 ..2..0..0..0..0....0..1..0..0..1....0..0..0..0..0....2..1..1..1..1 ..1..0..0..0..0....0..2..0..0..1....0..2..1..1..1....0..0..0..0..0 CROSSREFS Sequence in context: A004925 A369598 A276303 * A070955 A195856 A116216 Adjacent sequences: A224595 A224596 A224597 * A224599 A224600 A224601 KEYWORD nonn AUTHOR R. H. Hardin, Apr 11 2013 STATUS approved

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Last modified June 12 19:52 EDT 2024. Contains 373360 sequences. (Running on oeis4.)