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A052797
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A simple grammar.
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0
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0, 1, 5, 35, 310, 2980, 30526, 325655, 3581200, 40301850, 461925625, 5373527605, 63281397830, 752962948360, 9038406399150, 109321688626100, 1331047556550240, 16300720361555725, 200658900798443135
(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 754
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MAPLE
| spec := [S, {B=PowerSet(S), S=Prod(Z, B, B, B, B, B)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
| Sequence in context: A027392 A177354 A109253 * A151344 A015683 A000357
Adjacent sequences: A052794 A052795 A052796 * A052798 A052799 A052800
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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