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

1, 1, 4, 33, 426, 7670, 181000, 5376777, 195238792, 8472419484, 431606519268, 25440239275308, 1714357181128372, 130748750027622922, 11188498960336877296, 1066226987215138587095, 112415085220156146401380, 13037223283297354475403696

Offset: 0

Author

Emanuele Munarini, Jul 04 2011

Keywords

• nonn

Links

• Vincenzo Librandi, Table of n, a(n) for n = 0..47

Crossrefs

Cf. A047793.

Programs

Mathematica

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

Maxima

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