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A052757
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A simple grammar.
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1
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0, 1, 3, 12, 64, 363, 2214, 14043, 91857, 614676, 4189254, 28974915, 202870938, 1435094800, 10241197917, 73639001172, 533004547453, 3880381334415, 28395656513145, 208748382089131, 1540935621796941
(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 713
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MAPLE
| spec := [S, {S=Prod(B, B, B, Z), B=PowerSet(S)}, unlabeled]: seq(combstruct[count](spec, size=n), n=0..20);
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CROSSREFS
| Cf. A038079.
Sequence in context: A124562 A172450 A203508 * A206226 A029851 A201720
Adjacent sequences: A052754 A052755 A052756 * A052758 A052759 A052760
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KEYWORD
| easy,nonn
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AUTHOR
| encyclopedia(AT)pommard.inria.fr, Jan 25 2000
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