1,2

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).

D. R. Kaprekar, On Wonderful Demlo numbers, Math. Stud., 6 (1938), 68.

S. Plouffe, Approximations de S\'{e}ries G\'{e}n\'{e}ratrices et Quelques Conjectures, Dissertation, Universit\'{e} du Qu\'{e}bec \`{a} Montr\'{e}al, 1992.

S. Plouffe, 1031 Generating Functions and Conjectures, Universit\'{e} du Qu\'{e}bec \`{a} Montr\'{e}al, 1992.

Eric Weisstein's World of Mathematics, Link to a section of The World of Mathematics.

Eric Weisstein's World of Mathematics, Repunit

G.f.: x*(1+10*x) / ((1-x)*(1-10*x)*(1-100*x)).

G.f.:sage: taylor( mul( x*(1+10*x) / ((1-x)*(1-10*x)*(1-100*x)) for i in xrange(1,2)),x,0,23)# [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 03 2009]

A002477:=-(1+10*z)/(z-1)/(100*z-1)/(10*z-1); [S. Plouffe in his 1992 dissertation.]

lst={}; Do[p=((10^n-1)/9)^2; AppendTo[lst, p], {n, 0, 5!}]; lst [From Vladimir Orlovsky (4vladimir(AT)gmail.com), Sep 28 2008]

(Other) sage: [gaussian_binomial(n, 1, 10)^2 for n in xrange(1, 14)] # [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), Jun 03 2009]

Cf. A002275.

Sequence in context: A137466 A062689 A057139 this_sequence A068117 A080162 A030174

Adjacent sequences: A002474 A002475 A002476 this_sequence A002478 A002479 A002480

nonn,easy

N. J. A. Sloane (njas(AT)research.att.com).

Minor edits from N. J. A. Sloane (njas(AT)research.att.com), Aug 18 2009