A052814 A simple grammar.

0, 1, 1, 2, 6, 16, 49, 156, 511, 1723, 5942, 20817, 73938, 265611, 963225, 3521667, 12966696, 48037862, 178936340, 669748197, 2517688316, 9501290664, 35982633397, 136708135198, 520914346328, 1990230295787, 7622765394301, 29262526895379, 112571409093256

Offset

0,4

Links

Table of n, a(n) for n=0..28.

INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 779

Maple

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

Crossrefs

Sequence in context: A132803 A079565 A052890 * A192401 A151445 A213429

Adjacent sequences: A052811 A052812 A052813 * A052815 A052816 A052817

Keyword

easy,nonn

Author

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

Extensions

More terms from Sean A. Irvine, Dec 02 2021

Status

approved