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A068158 a(n) = floor[ n!/(R(n))! ], where R(n) = Digit reversal of n (A004086). 0
1, 1, 1, 1, 1, 1, 1, 1, 1, 3628800, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1216451004088320000, 106661318400, 1, 0, 0, 0, 0, 0, 0, 0, 44208809968698509772718080000000, 1320509264105545113600000, 10178348544000, 1, 0, 0, 0, 0, 0, 0 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,10

COMMENTS

If n < R(n) then a(n) =0, n is a palindrome a(n) = 1 and for n > R(n) n!/(R(n)! = an integer.

LINKS

Table of n, a(n) for n=1..39.

EXAMPLE

a(21) = 21! / 12! = 51090942171709440000/479001600 = 106661318400.

CROSSREFS

Sequence in context: A118813 A127229 A269128 * A011521 A321846 A226889

Adjacent sequences:  A068155 A068156 A068157 * A068159 A068160 A068161

KEYWORD

base,easy,nonn

AUTHOR

Amarnath Murthy, Feb 24 2002

STATUS

approved

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Last modified August 2 07:48 EDT 2021. Contains 346411 sequences. (Running on oeis4.)