id:A125055 - OEIS Search Results

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Diagonal of symmetric triangle A125053 located immediately below the central terms (A125054).

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1, 15, 285, 8475, 378105, 23823015, 2018820885, 221605991475, 30596648805105, 5189967817758015, 1061021392126671885, 257296819626005894475, 73023341368629447792105, 23978466652359211809453015 (list; graph; listen)

	OFFSET	`0,2`
	COMMENT	`Triangle A125053 is a variant of triangle A008301 (enumeration of binary trees) such that the left-most column is the secant numbers (A000364).`
	FORMULA	`a(n)=A125054(n+1)-2*A125054(n). - Philippe DELEHAM (kolotoko(AT)wanadoo.fr), Jul 22 2007`
	CROSSREFS	`Cf. A125053, A125054.` `Sequence in context: A060542 A095654 A069405 this_sequence A160397 A144349 A009064` `Adjacent sequences: A125052 A125053 A125054 this_sequence A125056 A125057 A125058`
	KEYWORD	`nonn`
	AUTHOR	`Paul D. Hanna (pauldhanna(AT)juno.com), Nov 21 2006`

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Last modified November 29 12:46 EST 2009. Contains 167659 sequences.

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