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 A192548 a(n) = sum(abs(stirling1(n,k))*stirling2(n+1,k+1),k=0..n). 1

%I #6 Mar 30 2012 18:55:30

%S 1,1,4,33,426,7670,181000,5376777,195238792,8472419484,431606519268,

%T 25440239275308,1714357181128372,130748750027622922,

%U 11188498960336877296,1066226987215138587095,112415085220156146401380,13037223283297354475403696

%N a(n) = sum(abs(stirling1(n,k))*stirling2(n+1,k+1),k=0..n).

%H Vincenzo Librandi, <a href="/A192548/b192548.txt">Table of n, a(n) for n = 0..47</a>

%t Table[Sum[Abs[StirlingS1[n,k]]StirlingS2[n+1,k+1],{k,0,n}],{n,0,100}]

%o (Maxima) makelist(sum(abs(stirling1(n,k))*stirling2(n+1,k+1),k,0,n),n,0,24);

%Y Cf. A047793.

%K nonn

%O 0,3

%A _Emanuele Munarini_, Jul 04 2011

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