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A052772
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A simple grammar.
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0
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0, 1, 4, 22, 156, 1193, 9748, 82916, 727088, 6524084, 59620732, 552970626, 5191935808, 49252903050, 471358286352, 4545310993994, 44121116086052, 430777978197156, 4227634212037728, 41680927531643928
(list; graph; refs; listen; history; internal format)
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OFFSET
| 0,3
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LINKS
| INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 729
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MAPLE
| spec := [S, {S=Prod(Z, B, B, B, B), B=PowerSet(S)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
| Sequence in context: A000307 A049376 A083410 * A052650 A198053 A197925
Adjacent sequences: A052769 A052770 A052771 * A052773 A052774 A052775
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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