A101125 Row sums of a Chebyshev number triangle.

1, 1, 1, 4, 13, 49, 233, 1240, 7201, 45521, 311225, 2285116, 17909309, 149080865, 1312597361, 12180044528, 118740086369, 1212695223137, 12942512039697, 144018843991220, 1667526171728525, 20053044685823697, 250043383489271193

Offset: 0

Author

Paul Barry, Dec 02 2004

Keywords

• easy
• nonn

Comments

Row sums of A101124.

Links

• Seiichi Manyama, Table of n, a(n) for n = 0..533
• Index entries for sequences related to Chebyshev polynomials.

Programs

Mathematica

Table[Sum[ChebyshevT[k, n-k], {k, 0, n}], {n, 0, 30}] (* Vaclav Kotesovec, Jan 20 2019 *)

PARI

{a(n) = sum(k=0, n, polchebyshev(k, 1, n-k))} \\ Seiichi Manyama, Jan 20 2019

Formula

a(n)=sum{k=0..n, if(k

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