A134482 Triangle read by rows: row n consists of n followed by the numbers n through 2n-2.

1, 2, 2, 3, 3, 4, 4, 4, 5, 6, 5, 5, 6, 7, 8, 6, 6, 7, 8, 9, 10, 7, 7, 8, 9, 10, 11, 12, 8, 8, 9, 10, 11, 12, 13, 14, 9, 9, 10, 11, 12, 13, 14, 15, 16, 10, 10, 11, 12, 13, 14, 15, 16, 17, 18, 11, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 12, 12, 13, 14, 15, 16

Offset: 1

Author

Gary W. Adamson, Oct 27 2007

Keywords

• nonn
• tabl

Comments

Row sums = A005448.

Examples

			First few rows of the triangle are:
1;
2, 2;
3, 3, 4;
4, 4, 5, 6;
5, 5, 6, 7, 8;
6, 6, 7, 8, 9, 10;
7, 7, 8, 9, 10, 11, 12;
...
		

Crossrefs

Cf. A005448.

Programs

Maple

T:=proc(n,k) if nEmeric Deutsch, Nov 24 2007

Mathematica

Flatten[Table[Join[{n},Range[n,2n-2]],{n,12}]] (* Harvey P. Dale, Jun 18 2013 *)

Formula

T(n,1)=n, T(n,k)=n+k-2 for 2<=k<=n. G.f.=z(1-2tz+2zt^2-t^3*z^3)/[(1-z)(1-tz)]^2. - Emeric Deutsch, Nov 24 2007

Extensions

Corrected and extended by Harvey P. Dale, Jun 18 2013