login
The OEIS is supported by the many generous donors to the OEIS Foundation.

 

Logo
Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
A131818 A130296 + A002260 - A000012. Triangle read by rows: row n consists of n, 2, 3, 4, ..., n. 7

%I #10 Feb 08 2022 19:31:07

%S 1,2,2,3,2,3,4,2,3,4,5,2,3,4,5,6,2,3,4,5,6,7,2,3,4,5,6,7,8,2,3,4,5,6,

%T 7,8,9,2,3,4,5,6,7,8,9,10,2,3,4,5,6,7,8,9,10,11,2,3,4,5,6,7,8,9,10,11,

%U 12,2,3,4,5,6,7,8,9,10,11,12

%N A130296 + A002260 - A000012. Triangle read by rows: row n consists of n, 2, 3, 4, ..., n.

%C Row sums = A034856; (1, 4, 8, 13, 19, 26, 34, ...).

%F A130296 + A002260 - A000012 as infinite lower triangular matrices.

%F T(n, 1) = n, T(n, k) = k for k > 1. - _Michel Marcus_, Feb 12 2014

%e First few rows of the triangle:

%e 1;

%e 2, 2;

%e 3, 2, 3;

%e 4, 2, 3, 4;

%e 5, 2, 3, 4, 5;

%e 6, 2, 3, 4, 5, 6;

%e 7, 2, 3, 4, 5, 6, 7;

%e ...

%t Table[Join[{n},Range[2,n]],{n,15}]//Flatten (* _Harvey P. Dale_, Feb 24 2021 *)

%o (PARI) t(n, k) = if (k==1, n, k); \\ _Michel Marcus_, Feb 12 2014

%Y Cf. A130296, A002260, A034856.

%K nonn,tabl

%O 1,2

%A _Gary W. Adamson_, Jul 18 2007

%E More terms from _Michel Marcus_, Feb 12 2014

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

License Agreements, Terms of Use, Privacy Policy. .

Last modified March 28 13:42 EDT 2024. Contains 371254 sequences. (Running on oeis4.)