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A101818 Triangle read by rows: (1/n)*T(n,h), where T(n,h) is the array in A101817. 2
1, 1, 1, 1, 6, 2, 1, 21, 36, 6, 1, 60, 300, 240, 24, 1, 155, 1800, 3900, 1800, 120, 1, 378, 9030, 42000, 50400, 15120, 720, 1, 889, 40572, 357210, 882000, 670320, 141120, 5040, 1, 2040, 169400, 2610720, 11677680, 17781120, 9313920, 1451520, 40320, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,5

COMMENTS

Column 2 is A066524.

LINKS

Table of n, a(n) for n=0..45.

FORMULA

T(n, h)=(1/n)*C(n, h)*U(n, h), where U(n, h) is the array in A019538.

EXAMPLE

First rows:

1

1 1

1 6 2

1 21 36 6

CROSSREFS

Cf. A066524, A090657, A101817, A101819, A101820, A101821.

Sequence in context: A002247 A124913 A181415 * A138186 A110321 A111553

Adjacent sequences:  A101815 A101816 A101817 * A101819 A101820 A101821

KEYWORD

nonn,tabl

AUTHOR

Clark Kimberling, Dec 17 2004

STATUS

approved

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Last modified November 22 10:31 EST 2014. Contains 249805 sequences.