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 A052675 E.g.f. (1-x)/(1-5x). 0
 1, 4, 40, 600, 12000, 300000, 9000000, 315000000, 12600000000, 567000000000, 28350000000000, 1559250000000000, 93555000000000000, 6081075000000000000, 425675250000000000000, 31925643750000000000000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 623 FORMULA E.g.f.: (-1+x)/(-1+5*x) Recurrence: {a(0)=1, (-5*n-5)*a(n)+a(n+1)=0, a(1)=4} 4*5^(n-1)*n!, n>0. MAPLE spec := [S, {S=Sequence(Prod(Sequence(Z), Union(Z, Z, Z, Z)))}, labeled]: seq(combstruct[count](spec, size=n), n=0..20); CROSSREFS Equals (4/5) * A052562. Sequence in context: A272261 A291817 A128573 * A141010 A141011 A090359 Adjacent sequences:  A052672 A052673 A052674 * A052676 A052677 A052678 KEYWORD easy,nonn AUTHOR encyclopedia(AT)pommard.inria.fr, Jan 25 2000 STATUS approved

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Last modified September 19 07:24 EDT 2020. Contains 337178 sequences. (Running on oeis4.)