A027508 - OEIS

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A027508

Second column of A027495.

1, 21, 227, 4283, 3303383, 4156965497, 2439821215787, 25768363425203859, 2832420937806122764581, 4560420339293289548844701, 1405739820979794860218217874663237 (list; graph; refs; listen; history; internal format)

	OFFSET	`2,2`
	FORMULA	`Numerators of sequence a[ 2, n ] in (a[ i, j ])^2 where a[ i, j ] = S(i, j)/BellNumber(i) if j<=i, 0 if j>i`
	CROSSREFS	`Sequence in context: A027812 A171112 A171108 * A161518 A162360 A161899` `Adjacent sequences: A027505 A027506 A027507 * A027509 A027510 A027511`
	KEYWORD	`nonn`
	AUTHOR	`Olivier Gerard (olivier.gerard(AT)gmail.com)`

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Last modified February 17 11:46 EST 2012. Contains 206011 sequences.