login
A227325
a(n) = A000272(n+1) * A000984(n).
2
1, 2, 18, 320, 8750, 326592, 15529668, 899678208, 61556811030, 4862000000000, 435644983598396, 43678490079264768, 4846281282497517772, 589650705050503577600, 78074729079345703125000, 11177395284330167371038720, 1720546364146510165684599270
OFFSET
0,2
LINKS
FORMULA
a(n) = A088956(2*n, n) = (n+1)^(n-1) * C(2*n, n).
PROG
(Haskell)
a227325 n = a000272 (n + 1) * a000984 n
CROSSREFS
Central terms of triangle A088956.
Sequence in context: A179497 A296837 A326270 * A350291 A087215 A229490
KEYWORD
nonn
AUTHOR
Reinhard Zumkeller, Jul 07 2013
EXTENSIONS
Typo in formula fixed by Zak Seidov, Jul 08 2013
STATUS
approved