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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.

A055589 Convolution of A049612 with A011782.

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%I A055589 #16 Sep 21 2024 11:13:17
%S A055589 0,1,6,26,96,321,1002,2972,8472,23392,62912,165504,427264,1085184,
%T A055589 2717184,6718464,16427008,39763968,95387648,226951168,535953408,
%U A055589 1257046016,2929852416,6789267456,15648423936,35888562176,81927340032
%N A055589 Convolution of A049612 with A011782.
%C A055589 Sixth column of triangle A055587. T(n,4) of array T as in A049600.
%H A055589 <a href="/index/Rec#order_05">Index entries for linear recurrences with constant coefficients</a>, signature (10, -40, 80, -80, 32).
%F A055589 a(n)= T(n, 4)= A055587(n+4, 5).
%F A055589 G.f.: x*((1-x)^4)/(1-2*x)^5.
%Y A055589 Cf. A049600, A049612, A055587, A011782.
%K A055589 nonn,easy
%O A055589 0,3
%A A055589 _Wolfdieter Lang_ May 30 2000