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 A038225 Top line of 4-wave sequence A038197, also bisection of A006357. 0
 1, 4, 30, 246, 2037, 16886, 139997, 1160693, 9623140, 79784098, 661478734, 5484227157, 45468956106, 376976720745, 3125460977225, 25912757426660, 214839027697334, 1781200165693270, 14767680082482085, 122436758775876478 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS F. v. Lamoen, Wave sequences Index entries for linear recurrences with constant coefficients, signature (10,-15,7,-1). FORMULA Let v(4)=(1, 1, 1, 1), let M(4) be the 4 X 4 matrix m(i, j) =min(i, j); then a(n)= min ( v(4)*M(4)^n) - Benoit Cloitre, Oct 03 2002 GF= ( 1-6*x+5*x^2-x^3 ) / ( (x-1)*(x^3-6*x^2+9*x-1) ). - Wouter Meeussen, Mar 19 2005 PROG (PARI) k=4; M(k)=matrix(k, k, i, j, min(i, j)); v(k)=vector(k, i, 1); a(n)=vecmin(v(k)*M(k)^n) CROSSREFS Sequence in context: A300159 A213102 A052604 * A086452 A091527 A201200 Adjacent sequences:  A038222 A038223 A038224 * A038226 A038227 A038228 KEYWORD nonn,easy AUTHOR STATUS approved

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Last modified April 3 18:40 EDT 2020. Contains 333198 sequences. (Running on oeis4.)