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A021026
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Decimal expansion of 1/22.
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0
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0, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5, 4, 5
(list; constant; graph; refs; listen; history; internal format)
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OFFSET
| 0,2
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FORMULA
| G.f.: x*(4+5*x)/(1-x^2) [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Mar 20 2009]
a(n)=(9/2)+[(-1)^n]/2-5*[C(2*n,n) mod 2], with n>=0 [From Paolo P. Lava (paoloplava(AT)gmail.com), Mar 31 2009]
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MATHEMATICA
| Join[{0}, RealDigits[1/22, 10, 120][[1]]] (* or *) CoefficientList[ Series[ x (4+5x)/(1-x^2), {x, 0, 120}], x] (* From Harvey P. Dale, Apr 29 2011 *)
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CROSSREFS
| Cf. A010710. [From Jaume Oliver Lafont (joliverlafont(AT)gmail.com), Mar 20 2009]
Sequence in context: A063694 A068901 A010710 * A126128 A046565 A046598
Adjacent sequences: A021023 A021024 A021025 * A021027 A021028 A021029
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KEYWORD
| nonn,cons
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AUTHOR
| N. J. A. Sloane (njas(AT)research.att.com).
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