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A140730 a(4*n)=5^n, a(4*n+1)=2*5^n, a(4*n+2)=3*5^n, a(4*n+3)=4*5^n. 5
1, 2, 3, 4, 5, 10, 15, 20, 25, 50, 75, 100, 125, 250, 375, 500, 625, 1250, 1875, 2500, 3125, 6250, 9375, 12500, 15625, 31250, 46875, 62500, 78125, 156250, 234375, 312500, 390625, 781250, 1171875, 1562500, 1953125, 3906250, 5859375, 7812500 (list; graph; refs; listen; history; internal format)
OFFSET

0,2

COMMENTS

a(n) = A140740(n+4,4).

FORMULA

a(n+1) = a(n) + a(n - n mod 4).

O.g.f.: (1+2x+3x^2+4x^3)/(1-5x^4). - R. J. Mathar (mathar(AT)strw.leidenuniv.nl), May 31 2008

CROSSREFS

Cf. A000079, A038754, A133464, A037124.

Sequence in context: A032940 A064419 A032543 * A205962 A134220 A179146

Adjacent sequences:  A140727 A140728 A140729 * A140731 A140732 A140733

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller (reinhard.zumkeller(AT)gmail.com), May 26 2008

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Last modified February 17 04:21 EST 2012. Contains 205978 sequences.