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%I #11 May 11 2014 22:35:14
%S 1,15,285,8475,378105,23823015,2018820885,221605991475,30596648805105,
%T 5189967817758015,1061021392126671885,257296819626005894475,
%U 73023341368629447792105,23978466652359211809453015
%N Diagonal of symmetric triangle A125053 located immediately below the central terms (A125054).
%C Triangle A125053 is a variant of triangle A008301 (enumeration of binary trees) such that the leftmost column gives the secant numbers (A000364).
%F a(n) = A125054(n+1) - 2*A125054(n). - _Philippe Deléham_, Jul 22 2007
%Y Cf. A125053, A125054.
%K nonn
%O 0,2
%A _Paul D. Hanna_, Nov 21 2006
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