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A003047 a(n) = Catalan(n) * Product a(k), k = 0 . . n-1.
(Formerly M1993)
2
1, 1, 2, 10, 280, 235200, 173859840000, 98238542885683200000000, 32169371027674057560745102540800000000000000000, 3518552669874927170883258602839130084576857453953842493259776000000000000000000000000000000000 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,3

REFERENCES

D.-Z. Du and F. K. Hwang, Combinatorial Group Testing and Its Applications, World Scientific, 2nd ed., 2000; p. 36.

J. W. Moon and M. Sobel, Enumerating a class of nested group testing procedures, J. Combin. Theory, B23 (1977), 184-188.

N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).

LINKS

Table of n, a(n) for n=1..10.

J. W. Moon, R. K. Guy, and N. J. A. Sloane, Correspondence, 1973

CROSSREFS

See A028580 for another version. Cf. A000108, A003046.

Sequence in context: A215286 A260231 * A028580 A171873 A098706 A143249

Adjacent sequences:  A003044 A003045 A003046 * A003048 A003049 A003050

KEYWORD

easy,nonn

AUTHOR

N. J. A. Sloane.

STATUS

approved

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Last modified July 20 16:53 EDT 2017. Contains 289628 sequences.