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A154680 Triangle read by rows where T(m,n)=2*m*n + m + n - 2. 3
2, 5, 10, 8, 15, 22, 11, 20, 29, 38, 14, 25, 36, 47, 58, 17, 30, 43, 56, 69, 82, 20, 35, 50, 65, 80, 95, 110, 23, 40, 57, 74, 91, 108, 125, 142, 26, 45, 64, 83, 102, 121, 140, 159, 178, 29, 50, 71, 92, 113, 134, 155, 176, 197, 218, 32, 55, 78, 101, 124, 147, 170, 193, 216, 239, 262 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

All terms are in A153052.

First column: A016789; second column: 5*A000027; third column: A016993; fourth column: A017185. - Vincenzo Librandi, Nov 18 2012

LINKS

Vincenzo Librandi, Rows n = 1..100, flattened

EXAMPLE

Triangle begins:

2;

5,  10;

8,  15, 22;

11, 20, 29, 38;

14, 25, 36, 47, 58;

17, 30, 43, 56, 69,  82;

20, 35, 50, 65, 80,  95,  110;

23, 40, 57, 74, 91,  108, 125, 142;

26, 45, 64, 83, 102, 121, 140, 159, 178;

29, 50, 71, 92, 113, 134, 155, 176, 197, 218; etc.

MATHEMATICA

Flatten[Table[Floor[2 n m + m + n - 2], {n, 1, 16}, {m, n}]] (* Vincenzo Librandi, May 14 2012 *)

PROG

(MAGMA) [2*n*k+n+k-2: k in [1..n], n in [1..11]]; // Vincenzo Librandi, Nov 18 2012

CROSSREFS

Cf. A153052, A089038, A016789, A000027, A017185.

Sequence in context: A188525 A126842 A291933 * A140469 A001440 A258779

Adjacent sequences:  A154677 A154678 A154679 * A154681 A154682 A154683

KEYWORD

nonn,tabl,easy

AUTHOR

Vincenzo Librandi, Jan 18 2009

STATUS

approved

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Last modified February 17 19:37 EST 2019. Contains 320223 sequences. (Running on oeis4.)