A076883 Let u(0)=1, u(n) = 5/2 * floor(u(n-1)); then a(n) = (2/5)*u(n).

1, 2, 5, 12, 30, 75, 187, 467, 1167, 2917, 7292, 18230, 45575, 113937, 284842, 712105, 1780262, 4450655, 11126637, 27816592, 69541480, 173853700, 434634250, 1086585625, 2716464062, 6791160155, 16977900387, 42444750967, 106111877417

Offset: 1

Author

Benoit Cloitre, Nov 25 2002

Keywords

• nonn

Comments

May be equivalently defined by (1) a(n) = floor(u(n-1)) or (2) a(1) = 1, a(n) = floor(5/2 * a(n - 1)). - Joel B. Lewis, Jul 18 2008

Programs

Mathematica

NestList[Floor[5/2 #]&,1,30] (* Harvey P. Dale, Apr 18 2012 *)

Formula

a(n)=ceiling(c*(5/2)^n) with c=0.76461665854988933665808275090184088890217299...