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Number of permutations of 1..n+6 with the number moved left exceeding the number moved right by n or more
1

%I #4 Mar 31 2012 12:35:45

%S 1823,6095,19389,59939,182284,549268,1646856,4925510,14716637,

%T 43963245,131367367,392727885,1174712338,3515619386,10526412826,

%U 31531005592,94480820299,283184511707,848966332193,2545573595015,7633751214888

%N Number of permutations of 1..n+6 with the number moved left exceeding the number moved right by n or more

%C Recurrence would also extend to an a(0) if the definition were made to exclude the identity permutation

%H R. H. Hardin, <a href="/A179581/b179581.txt">Table of n, a(n) for n=1..45</a>

%F Empirical: a(n)=14*a(n-1)-85*a(n-2)+294*a(n-3)-639*a(n-4)+906*a(n-5)-839*a(n-6)+490*a(n-7)-164*a(n-8)+24*a(n-9) ; G.f.: -x*(1823-19427*x+89014*x^2-229394*x^3+364170*x^4-365192*x^5+226176*x^6-79168*x^7+12000*x^8) / ( (-1+3*x)*(2*x-1)^3*(x-1)^5 ).

%K nonn

%O 1,1

%A _R. H. Hardin_, g.f. from R. J. Mathar in the Sequence Fans Mailing List, Jul 19 2010

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Last modified September 21 15:43 EDT 2024. Contains 376087 sequences. (Running on oeis4.)