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A166337 a(n)=(2n+0^n)*C(4n,2n). 7

%I

%S 1,12,280,5544,102960,1847560,32449872,561632400,9617286240,

%T 163352435400,2756930576400,46290177201840,773942488394400,

%U 12893881856650704,214163336821292320,3547937446945842720

%N a(n)=(2n+0^n)*C(4n,2n).

%C The aerated sequence gives the central coefficients in number triangle A166335.

%t Join[{1},Table[(2n)*Binomial[4n,2n],{n,20}]] (* _Harvey P. Dale_, Jan 21 2015 *)

%K easy,nonn

%O 0,2

%A _Paul Barry_, Oct 12 2009

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Last modified October 3 18:24 EDT 2022. Contains 357237 sequences. (Running on oeis4.)