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A021554 Decimal expansion of 1/550. 0
0, 0, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1, 8, 1 (list; constant; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

A021059 shifted right, A010689 shifted right twice. [From R. J. Mathar, Oct 25 2008]

LINKS

Table of n, a(n) for n=0..98.

FORMULA

a(n)=(1/2)*[9-7*(-1)^n]-[C(2*n,n) mod 2]-8*{C[(n+1)^2,n+3] mod 2}, with n>=0 [From Paolo P. Lava, Nov 20 2009]

PROG

(PARI) { default(realprecision); x=1/550*10; for(n=1, 100, d=floor(x); x=(x-d)*10; print1(d, ", ")) } \\ Felix Fröhlich, Aug 11 2014

CROSSREFS

Sequence in context: A143548 A231929 A154460 * A021059 A010689 A070637

Adjacent sequences:  A021551 A021552 A021553 * A021555 A021556 A021557

KEYWORD

nonn,cons

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified September 28 00:46 EDT 2021. Contains 347698 sequences. (Running on oeis4.)