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 A052695 E.g.f. (2-5x)/((1-4x)(1-x)). 0
 2, 5, 34, 390, 6168, 123000, 2949840, 82580400, 2642451840, 95127177600, 3805076217600, 167423233824000, 8036313786547200, 417888298219392000, 23401744438751078400, 1404104662402041600000, 89862698330962292736000 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 LINKS INRIA Algorithms Project, Encyclopedia of Combinatorial Structures 644 FORMULA E.g.f.: -(-2+5*x)/(-1+4*x)/(-1+x) Recurrence: {a(1)=5, a(0)=2, (4*n^2+12*n+8)*a(n)+(-10-5*n)*a(n+1)+a(n+2)=0} (4^n+1)*n! MAPLE spec := [S, {S=Union(Sequence(Z), Sequence(Union(Z, Z, Z, Z)))}, labeled]: seq(combstruct[count](spec, size=n), n=0..20); CROSSREFS Sequence in context: A208985 A114793 A027303 * A184360 A206830 A002665 Adjacent sequences:  A052692 A052693 A052694 * A052696 A052697 A052698 KEYWORD easy,nonn AUTHOR encyclopedia(AT)pommard.inria.fr, Jan 25 2000 STATUS approved

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