Search: id:A001261
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%I A001261 M4273 N1786
%S A001261 1,6,63,616,6678,77868,978978,13216104,190899423,2939850914,48106651593,
%T A001261 833848627248,15265844099324,294412707629208,5966764207952724,
%U A001261 126793739418994416,2819296088257641741,65470320271760790078
%N A001261 Number of permutations of length n by rises.
%D A001261 N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, 
               Academic Press, 1995 (includes this sequence).
%D A001261 N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 
               (includes this sequence).
%D A001261 F. N. David, M. G. Kendall and D. E. Barton, Symmetric Function and Allied 
               Tables, Cambridge, 1966, p. 263.
%F A001261 E.g.f.: x^5/5!*exp(-x)/(1-x)^2. - Vladeta Jovovic (vladeta(AT)eunet.rs), 
               Jan 03 2003
%p A001261 a:=n->sum((n+3)!*sum((-1)^k/k!/5!, j=1..n), k=0..n): seq(a(n), n=2..19); 
               - Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), May 25 2007
%Y A001261 Cf. A010027, A000255, A000166, A000274, A000313, A001260.
%Y A001261 A diagonal in triangle A010027.
%Y A001261 Sequence in context: A039937 A134112 A071588 this_sequence A132078 A113669 
               A121415
%Y A001261 Adjacent sequences: A001258 A001259 A001260 this_sequence A001262 A001263 
               A001264
%K A001261 nonn
%O A001261 6,2
%A A001261 N. J. A. Sloane (njas(AT)research.att.com).
%E A001261 More terms from Vladeta Jovovic (vladeta(AT)eunet.rs), Jan 03 2003

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