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a(n) = n*A004141(n).
1

%I #13 Jun 29 2017 17:42:25

%S 1,4,24,192,1280,7680,48384,315392,1916928,11182080,72089600,

%T 441188352,2589982720,15863644160,97493975040,578813952000,

%U 3411143557120,21023026053120,125795699785728,733623363829760,4459657816965120,26839963597275136,157885776644800512

%N a(n) = n*A004141(n).

%H D. W. Kammler and R. J. McGlinn, <a href="http://www.jstor.org/stable/2320150">Local conditioning of parametric forms used to approximate continuous functions</a>, Amer. Math. Monthly, 86 (1979), 841-845.

%H D. W. Kammler and R. J. McGlinn, <a href="/A004141/a004141.pdf">Local conditioning of parametric forms used to approximate continuous functions</a>, Amer. Math. Monthly, 86 (1979), 841-845. [Annotated scan of page 843 only]

%Y Cf. A004140.

%K nonn

%O 1,2

%A _N. J. A. Sloane_, Jul 09 2015