Search: id:A053487
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%I A053487
%S A053487 1,5,26,142,824,5144,34960,261104,2154368,19651456,197563136,2177388800,
%T A053487 26145442816,339957865472,4759678552064,71396252022784,1142344327331840,
%U A053487 19419870744510464,349557742120665088,6641597375170543616,132831948602922500096
%N A053487 E.g.f.: exp(4x)/(1-x).
%H A053487 J. W. Layman, <a href="http://www.cs.uwaterloo.ca/journals/JIS/index.html">
               The Hankel Transform and Some of its Properties</a>, J. Integer Sequences, 
               4 (2001), #01.1.5.
%F A053487 a(n) is the permanent of the n X n matrix with 5's on the diagonal and 
               1's elsewhere. a(n) = Sum(k=0..n, A008290(n, k)*5^k) . - DELEHAM 
               Philippe (kolotoko(AT)wanadoo.fr), Dec 12 2003
%p A053487 restart:F(x):=exp(4*x)/(1-x): f[0]:=F(x): for n from 1 to 20 do f[n]:=diff(f[n-1],
               x) od: x:=0: seq(f[n],n=0..20);# [From Zerinvary Lajos (zerinvarylajos(AT)yahoo.com), 
               Apr 03 2009]
%Y A053487 Sequence in context: A081187 A104498 A045379 this_sequence A082029 A001705 
               A081047
%Y A053487 Adjacent sequences: A053484 A053485 A053486 this_sequence A053488 A053489 
               A053490
%K A053487 nonn
%O A053487 0,2
%A A053487 N. J. A. Sloane (njas(AT)research.att.com), Jan 15 2000

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