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URL: https://oeis.org/A101820

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A101820

Triangle read by rows: T(n,h)/(n-1), where T is the array in A101819.

1

1, 1, 3, 1, 14, 12, 1, 45, 150, 60, 1, 124, 1080, 1560, 360, 1, 315, 6020, 21000, 16800, 2520, 1, 762, 28980, 204120, 378000, 191520, 20160, 1, 1785, 127050, 1631700, 5838840, 6667920, 2328480, 181440, 1, 4088, 522480, 11459280, 71442000

(list; table; graph; refs; listen; history; text; internal format)

OFFSET

0,3

LINKS

Table of n, a(n) for n=0..40.

Paul Barry, The Gamma-Vectors of Pascal-like Triangles Defined by Riordan Arrays, arXiv:1804.05027 [math.CO], 2018.

FORMULA

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

EXAMPLE

First rows:

1

1 3

1 14 12

4 45 150 60

CROSSREFS

Cf. A019538, A101817, A101819, A101821.

Sequence in context: A079640 A079638 A018858 * A055301 A286704 A286080

Adjacent sequences: A101817 A101818 A101819 * A101821 A101822 A101823

KEYWORD

nonn,tabl

AUTHOR

Clark Kimberling, Dec 17 2004

STATUS

approved