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 A163674 Triangle T(n,m) = 2*m*n + m + n + 9 read by rows. 4
 13, 16, 21, 19, 26, 33, 22, 31, 40, 49, 25, 36, 47, 58, 69, 28, 41, 54, 67, 80, 93, 31, 46, 61, 76, 91, 106, 121, 34, 51, 68, 85, 102, 119, 136, 153, 37, 56, 75, 94, 113, 132, 151, 170, 189, 40, 61, 82, 103, 124, 145, 166, 187, 208, 229, 43, 66, 89, 112, 135, 158, 181 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,1 COMMENTS 2*T(m,n) - 17 =(2*n+1)*(2*m+1) and 2*T(n,n) - 17 is a square. Also: first column: A112414; second column: A016861; third column: A017041; fourth column: A017209. [Vincenzo Librandi, Nov 20 2012] LINKS Vincenzo Librandi, Rows n = 1..100, flattened FORMULA T(n,m) = A163657(n,m) + 1. EXAMPLE Triangle begins: 13; 16, 21; 19, 26, 33; 22, 31, 40, 49; 25, 36, 47, 58, 69; 28, 41, 54, 67, 80, 93; 31, 46, 61, 76, 91, 106, 121; 34, 51, 68, 85, 102, 119, 136, 153; MATHEMATICA t[n_, k_]:=2 n*k + n + k + 9; Table[t[n, k], {n, 15}, {k, n}]//Flatten (* Vincenzo Librandi, Nov 20 2012 *) PROG (Magma) [2*n*k + n + k + 9: k in [1..n], n in [1..11]]; // Vincenzo Librandi, Nov 20 2012 (PARI) for(n=1, 10, for(m=1, n, print1(2*m*n + m + n + 9, ", "))) \\ G. C. Greubel, Aug 02 2017 CROSSREFS Cf. A016861, A017041, A017209, A112414, A153051, A163657. Sequence in context: A159975 A350300 A110623 * A280062 A132947 A205876 Adjacent sequences: A163671 A163672 A163673 * A163675 A163676 A163677 KEYWORD nonn,easy,tabl AUTHOR Vincenzo Librandi, Aug 03 2009 EXTENSIONS Edited by R. J. Mathar, Oct 12 2009 STATUS approved

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Last modified October 3 11:12 EDT 2023. Contains 365861 sequences. (Running on oeis4.)