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 A121958 Quadratic n^2-n-1 functional matrix Markov of the A001053 type. 1
 0, 1, 1, 6, 67, 1279, 37158, 1524757, 83898793, 5958339060, 530376075133, 57816950528557, 7574550895316100, 1174113205724524057, 212522064787034170417, 44418285653695866141210 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,4 COMMENTS Gets large very fast. LINKS Robert Israel, Table of n, a(n) for n = 1..254 FORMULA a(n) = a(n-2) + (n^2 - 3*n + 1)*a(n-1) with a(1)=0, a(2)=1, a(3)=1. - Robert Israel, Dec 18 2018 MAPLE f:= gfun:-rectoproc({a(n) = a(n-2)+(n^2-3*n+1)*a(n-1), a(1)=0, a(2)=1}, a(n), remember): map(f, [\$1..30]); # Robert Israel, Dec 18 2018 MATHEMATICA M[n_] := {{0, 1}, {1, n^2 - n - 1} } v[1] = {0, 1} v[n_] := v[n] = M[n].v[n - 1] a = Table[v[n][[1]], {n, 1, 30}] CROSSREFS Cf. A001053. Sequence in context: A073562 A230342 A239301 * A177555 A054746 A116005 Adjacent sequences:  A121955 A121956 A121957 * A121959 A121960 A121961 KEYWORD nonn AUTHOR Roger L. Bagula, Sep 02 2006 EXTENSIONS Edited by Robert Israel, Dec 18 2018 STATUS approved

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Last modified November 30 16:22 EST 2021. Contains 349423 sequences. (Running on oeis4.)