A075352 - OEIS

A075352

Group the natural numbers so that the product of the terms of the n-th group is just >= n!: (1), (2), (3, 4), (5, 6), (7, 8, 9), (10, 11, 12), (13, 14, 15, 16), (17, 18, 19, 20), (21, 22, 23, 24, 25), (26, 27, 28, 29, 30), ... Sequence gives product of numbers in each group.

1, 2, 12, 30, 504, 1320, 43680, 116280, 6375600, 17100720, 1402410240, 3776965920, 8835488640, 1022755734000, 2478652606080, 380634949094400, 945378254620800, 186127248627129600, 470489622136934400, 115590003914312928000

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OFFSET

1,2

LINKS

Table of n, a(n) for n=1..20.

CROSSREFS

Cf. A075353, A075354, A075355, A075356.

Sequence in context: A124903 A197954 A276451 * A116655 A361760 A085892

Adjacent sequences: A075349 A075350 A075351 * A075353 A075354 A075355

KEYWORD

nonn

AUTHOR

Amarnath Murthy, Sep 19 2002

EXTENSIONS

More terms from David Wasserman, Jan 16 2005

STATUS

approved