login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A155947 A triangle of polynomial coefficients: q(x,n)=(1 - x)^(n + 1)*Sum[(k + n)^n*x^k, {k, 0, Infinity}]; p(x,n)=q(x,n)+x^n*q(1/x,n). 0

%I

%S 1,1,2,5,-6,5,19,-13,-13,19,337,-1044,1462,-1044,337,2101,-5073,3092,

%T 3092,-5073,2101,62281,-314222,718559,-931796,718559,-314222,62281,

%U 543607,-2329829,3835365,-2044103,-2044103,3835365,-2329829,543607

%N A triangle of polynomial coefficients: q(x,n)=(1 - x)^(n + 1)*Sum[(k + n)^n*x^k, {k, 0, Infinity}]; p(x,n)=q(x,n)+x^n*q(1/x,n).

%C Row sums are:2*n!

%C {2, 2, 4, 12, 48, 240, 1440, 10080, 80640, 725760, 7257600,...}.

%C The result is related to the Eulerian numbers infinite sum form.

%C This was the result of finding the infinite sum identity:

%C Sum[Binomial[k+n,n]*x^k,{k,0,Infinity}]=1/(1-x)^(n+1).

%F q(x,n)=(1 - x)^(n + 1)*Sum[(k + n)^n*x^k, {k, 0, Infinity}];

%F q(x,n)=(1 - x)^(n + 1)*LerchPhi[x, -n, n];

%F p(x,n)=q(x,n)+x^n*q(1/x,n);

%F t(n,m)=coefficients(p(x,n))

%e {1, 1},

%e {2},

%e {5, -6, 5},

%e {19, -13, -13, 19},

%e {337, -1044, 1462, -1044, 337},

%e {2101, -5073, 3092, 3092, -5073, 2101},

%e {62281, -314222, 718559, -931796, 718559, -314222, 62281},

%e {543607, -2329829, 3835365, -2044103, -2044103, 3835365, -2329829, 543607},

%e {22542017, -158151816, 509366204, -972472504, 1197512838, -972472504, 509366204, -158151816, 22542017},

%e {253202761, -1572381217, 4145530310, -5521116358, 2695127384, 2695127384, -5521116358, 4145530310, -1572381217, 253202761},

%e {13486784401, -121343461986, 506850150853, -1285984548968, 2186943445546, -2599897482092, 2186943445546, -1285984548968, 506850150853, -121343461986, 13486784401}

%t Clear[p, x, n, m];

%t p[x_, n_] = (1 - x)^(n + 1)*Sum[(k + n)^n*x^k, {k, 0, Infinity}];

%t Table[FullSimplify[ExpandAll[p[x, n]]], {n, 0, 10}];

%t Table[CoefficientList[FullSimplify[ExpandAll[p[x, n]]], x]

%t + Reverse[ CoefficientList[FullSimplify[ExpandAll[p[x, n]]], x]], {n, 0, 10}];

%t Flatten[%]

%K sign,tabl,uned

%O 0,3

%A _Roger L. Bagula_, Jan 31 2009

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 20 09:55 EST 2022. Contains 350471 sequences. (Running on oeis4.)