A241581 Row sums in triangle A241580.

1, 1, 8, 54, 584, 7350, 114162, 2053688, 42513984, 991883610, 25807006730, 740614555692, 23250961252752, 792694751381078, 29169262097277330, 1152329533163353680, 48645406703597457152, 2185462919071085059890, 104113841197940277430554, 5242449827954998459195220

Offset

1,3

Links

Alois P. Heinz, Table of n, a(n) for n = 1..200

R. K. Guy, Letter to N. J. A. Sloane, Jun 21, 1975

Formula

a(n) = (n^n-A241580(n+1,1))/n.

a(n) = A245687(n,1)/n. - Alois P. Heinz, Jul 29 2014

Maple

M:=20;
T[1, 1]:=1:
for n from 2 to M do
   T[n, n]:=(n-1)^(n-1);
   for k from n-1 by -1 to 1 do
      T[n, k]:=T[n, k+1]-(n-1)*T[n-1, k]:
od:
od:
f:=n->(n^n-T[n+1, 1])/n; [seq(f(n), n=1..M-1)];

Crossrefs

Cf. A241580, A231797, A245687.

Sequence in context: A013499 A134825 A279854 * A052690 A304589 A027525

Adjacent sequences: A241578 A241579 A241580 * A241582 A241583 A241584

Keyword

nonn

Author

N. J. A. Sloane, Apr 29 2014

Status

approved