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A143216 Triangle read by rows, T(n,k) = n!*k!, 0<=k<=n. 1
1, 1, 1, 2, 2, 4, 6, 6, 12, 36, 24, 24, 48, 144, 576, 120, 120, 240, 720, 2880, 14400, 720, 720, 1440, 4320, 17280, 86400, 518400, 5040, 5040, 10080, 30240, 120960, 604800, 3628800, 25401600, 40320, 40320, 80640, 241920, 967680, 4838400, 29030400 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

Row sums = A143217: (1, 2, 8, 60, 816, 18480,...).

LINKS

Table of n, a(n) for n=0..42.

FORMULA

Triangle read by rows, T(n,k) = n!*k!, 0<=k<=n

EXAMPLE

First few rows of the triangle =

1;

1, 1;

2, 2, 4;

6, 6, 12, 36;

24, 24, 48, 144, 576;

120, 120, 240, 720, 2880, 14400;

720, 720, 1440, 4320, 17280, 86400, 518400;

...

T(6,3) = 4320 = 6!*3! = 720*6.

CROSSREFS

Cf. A000142, A143217.

Sequence in context: A092991 A102425 A162608 * A086536 A053045 A152424

Adjacent sequences:  A143213 A143214 A143215 * A143217 A143218 A143219

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Jul 30 2008

STATUS

approved

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Last modified January 18 01:05 EST 2020. Contains 330995 sequences. (Running on oeis4.)