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 A155724 Triangle read by rows: T(m,n) = 2mn + m + n - 4. 6
 0, 3, 8, 6, 13, 20, 9, 18, 27, 36, 12, 23, 34, 45, 56, 15, 28, 41, 54, 67, 80, 18, 33, 48, 63, 78, 93, 108, 21, 38, 55, 72, 89, 106, 123, 140, 24, 43, 62, 81, 100, 119, 138, 157, 176, 27, 48, 69, 90, 111, 132, 153, 174, 195, 216, 30, 53, 76, 99, 122, 145, 168, 191, 214, 237, 260 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS 2*T(m,n)+9 = (2m+1)*(2n+1). - Vincenzo Librandi, Nov 18 2012 First column: A008585; second column: A016885; third column: A017053; fourth column: 9*A020705. - Vincenzo Librandi, Nov 18 2012 LINKS Vincenzo Librandi, Rows n = 1..100, flattened FORMULA T(m,n) = A154685(m,n) - 8. - L. Edson Jeffery, Oct 12 2012 EXAMPLE Triangle begins: 0; 3, 8; 6, 13, 20; 9, 18, 27, 36; 12, 23, 34, 45, 56; 15, 28, 41, 54, 67, 80; 18, 33, 48, 63, 78, 93, 108; 21, 38, 55, 72, 89, 106, 123, 140; 24, 43, 62, 81, 100, 119, 138, 157, 176; 27, 48, 69, 90, 111, 132, 153, 174, 195, 216; MATHEMATICA Flatten[Table[2 n m + m + n - 4, {n, 10}, {m, n}]] (* Vincenzo Librandi, Mar 01 2012 *) PROG (Magma) /* Triangle: */ [[2*m*n+m+n-4: m in [1..n]]: n in [1..10]]; // Bruno Berselli, Aug 31 2012 CROSSREFS All terms are in A155723. Cf. A154685, A155722, A162261 (row sums), A008585, A016885, A017053, A020705. Sequence in context: A371472 A295573 A080939 * A289485 A304299 A221951 Adjacent sequences: A155721 A155722 A155723 * A155725 A155726 A155727 KEYWORD nonn,tabl,easy AUTHOR Vincenzo Librandi, Jan 25 2009 EXTENSIONS Edited by N. J. A. Sloane, Jun 23 2010 STATUS approved

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Last modified July 21 14:09 EDT 2024. Contains 374474 sequences. (Running on oeis4.)