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A052879 A simple grammar. 0
1, 1, 2, 7, 22, 81, 303, 1178, 4675, 18951, 77925, 324642, 1366718, 5806575, 24861979, 107178994, 464805955, 2026418389, 8876266930, 39045009419, 172406753611 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,3

LINKS

Table of n, a(n) for n=0..20.

INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 850

MAPLE

spec := [S, {B=Sequence(C, 1 <= card), C=Prod(Z, S), S= PowerSet(B)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);

CROSSREFS

Sequence in context: A047095 A110137 A097967 * A007867 A241156 A014558

Adjacent sequences:  A052876 A052877 A052878 * A052880 A052881 A052882

KEYWORD

easy,nonn

AUTHOR

encyclopedia(AT)pommard.inria.fr, Jan 25 2000

STATUS

approved

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Last modified October 14 03:58 EDT 2019. Contains 327995 sequences. (Running on oeis4.)