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A134482 Triangle read by rows: row n consists of n followed by the numbers n through 2n-2. 1
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 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,2

COMMENTS

Row sums = A005448.

LINKS

Table of n, a(n) for n=1..72.

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

EXAMPLE

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;

...

MAPLE

T:=proc(n, k) if n<k then 0 elif k=1 then n else n+k-2 end if end proc: for n to 10 do seq(T(n, k), k=1..n) end do; # yields sequence in triangular form - Emeric Deutsch, Nov 24 2007

MATHEMATICA

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

CROSSREFS

Cf. A005448.

Sequence in context: A050506 A155213 A029122 * A132921 A181988 A194173

Adjacent sequences:  A134479 A134480 A134481 * A134483 A134484 A134485

KEYWORD

nonn,tabl

AUTHOR

Gary W. Adamson, Oct 27 2007

EXTENSIONS

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

STATUS

approved

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Last modified April 24 03:31 EDT 2014. Contains 240947 sequences.