cp's OEIS Frontend

This is a front-end for the Online Encyclopedia of Integer Sequences, made by Christian Perfect. The idea is to provide OEIS entries in non-ancient HTML, and then to think about how they're presented visually. The source code is on GitHub.

A179087 Triangle T(n,k) read by rows: the real part of the coefficient [x^k] of (1-x)^(n+1) * Sum_{s>=0} ((2*s + 1 + 2*i)^n)*x^s, where i is the imaginary unit.

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%I A179087 #15 May 04 2019 23:07:00
%S A179087 1,1,1,-3,14,-3,-11,35,35,-11,-7,-84,566,-84,-7,41,-843,2722,2722,
%T A179087 -843,41,117,-2854,763,50028,763,-2854,117,29,-4681,-80211,407423,
%U A179087 407423,-80211,-4681,29,-527,4504,-720740,1560616,8634214,1560616,-720740,4504,-527,-1199,68393,-4275340,-6925948,104031374,104031374,-6925948,-4275340,68393,-1199,237,338918,-19903639,-195090616,799237802,2546725796,799237802,-195090616
%N A179087 Triangle T(n,k) read by rows: the real part of the coefficient [x^k] of (1-x)^(n+1) * Sum_{s>=0} ((2*s + 1 + 2*i)^n)*x^s, where i is the imaginary unit.
%e A179087 Triangle begins
%e A179087     1;
%e A179087     1,     1;
%e A179087    -3,    14,     -3;
%e A179087   -11,    35,     35,    -11;
%e A179087    -7,   -84,    566,    -84,     -7;
%e A179087    41,  -843,   2722,   2722,   -843,     41;
%e A179087   117, -2854,    763,  50028,    763,  -2854,   117;
%e A179087    29, -4681, -80211, 407423, 407423, -80211, -4681, 29;
%p A179087 A179087 := proc(n,k)
%p A179087         (1-x)^(n+1)*add( (2*s+1+2*I)^n*x^s,s=0..k) ;
%p A179087         expand(%) ;
%p A179087         coeftayl(%,x=0,k) ;
%p A179087         Re(%) ;
%p A179087 end proc: # _R. J. Mathar_, Oct 06 2011
%Y A179087 Cf. A000165 (row sums), A006495 (column k=0).
%K A179087 sign,tabl
%O A179087 0,4
%A A179087 _Roger L. Bagula_, Jun 28 2010
%E A179087 Sequence replaced with one that is more likely to occur in practice by _R. J. Mathar_, Oct 06 2011