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A225621 Central terms of the triangle in A074911. 3
1, 4, 20, 108, 632, 4060, 28968, 231000, 2058096, 20375964, 222393800, 2653879624, 34365597840, 479776469848, 7181892528272, 114731622081840, 1948073992109280, 35031456100431900, 665075537735997960, 13292908401187179240, 279000321119414475600 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

a(n) = A074911(2*n-1,n).

LINKS

Table of n, a(n) for n=1..21.

PROG

(Haskell)

a225621 n = a074911 (2 * n - 1) n

CROSSREFS

Cf. A227791.

Sequence in context: A243585 A263965 A265084 * A020084 A026127 A222205

Adjacent sequences:  A225618 A225619 A225620 * A225622 A225623 A225624

KEYWORD

nonn

AUTHOR

Reinhard Zumkeller, Aug 05 2013

STATUS

approved

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Last modified June 27 11:25 EDT 2017. Contains 288788 sequences.