This site is supported by donations to The OEIS Foundation.



Annual Appeal: Please make a donation to keep the OEIS running. In 2018 we replaced the server with a faster one, added 20000 new sequences, and reached 7000 citations (often saying "discovered thanks to the OEIS").
Other ways to donate

(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A081114 Triangle read by rows of T(n,k)=n*T(n-1,k)+n-k starting at T(n,n)=0. 0


%S 0,1,0,4,1,0,15,5,1,0,64,23,6,1,0,325,119,33,7,1,0,1956,719,202,45,8,

%T 1,0,13699,5039,1419,319,59,9,1,0,109600,40319,11358,2557,476,75,10,1,

%U 0,986409,362879,102229,23019,4289,679,93,11,1,0,9864100,3628799,1022298

%N Triangle read by rows of T(n,k)=n*T(n-1,k)+n-k starting at T(n,n)=0.

%C Taking the triangle into negative values of n and k would produce results close to (k+1)*e*n! - 1, i.e. one less than multiples of A000522 for nonnegative n.

%F For k>0, T(n, k)=ceiling[ (A001339(k-1)/(k-1)! - (k-1)*e) *n! - 1] where A001339(k-1)=ceiling[(k-1)!*(k-1)*e for k>1]. T(n, 0)=floor[e*n! - 1] for n>0; T(n, 1)=n!-1. T(n, n)=0; T(n, n-1)=n+2; T(n, n-2)=n^2+3n+5=A027688(n+1).

%e Rows start: 0; 1,0; 4,1,0; 15,5,1,0; 64,23,6,1,0; 325,119,33,7,1,0; etc.

%Y Columns include A007526 and A033312.

%K nonn,tabl

%O 0,4

%A _Henry Bottomley_, Apr 16 2003

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified December 16 15:11 EST 2018. Contains 318172 sequences. (Running on oeis4.)