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A018244 A self-generating sequence: there are a(n) (k+1)'s between successive k's, where k=3. 1
3, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 4, 3, 4, 4, 4 (list; graph; refs; listen; history; internal format)
OFFSET

1,1

MAPLE

k := 3; A018244 := proc(n) global k; floor(n*(k+sqrt(k^2+4*k))/2)-floor((n-1)*(k+sqrt(k^2+4*k))/2); end;

CROSSREFS

Cf. A001468, A007538.

Sequence in context: A199185 A143490 A007485 * A090589 A113311 A064042

Adjacent sequences:  A018241 A018242 A018243 * A018245 A018246 A018247

KEYWORD

nonn

AUTHOR

Jonas Wallgren (jwc(AT)ida.liu.se)

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Last modified February 16 14:37 EST 2012. Contains 205930 sequences.