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 A241747 Triangle read by rows: T(n,k) = (4*n+3)*(4*k+3). 1
 9, 21, 49, 33, 77, 121, 45, 105, 165, 225, 57, 133, 209, 285, 361, 69, 161, 253, 345, 437, 529, 81, 189, 297, 405, 513, 621, 729, 93, 217, 341, 465, 589, 713, 837, 961, 105, 245, 385, 525, 665, 805, 945, 1085, 1225, 117, 273, 429, 585, 741, 897, 1053, 1209, 1365, 1521 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS A016838(n) first diagonal. A085027(n) second diagonal. A017629(n) column k=0. Row sums give the second bisection of A002414: 9, 70, 231, 540, 1045, 1794, 2835, 4216, ... [Bruno Berselli, May 08 2014] LINKS Vincenzo Librandi, Rows n = 0..100, flattened EXAMPLE Triangle begins: n\k |   0     1     2    3    4    5     6     7     8     9 ----|-------------------------------------------------------- 0   |   9; 1   |  21,   49; 2   |  33,   77,  121; 3   |  45,  105,  165, 225; 4   |  57,  133,  209, 285, 361; 5   |  69,  161,  253, 345, 437, 529; 6   |  81,  189,  297, 405, 513, 621,  729; 7   |  93,  217,  341, 465, 589, 713,  837,  961; 8   | 105,  245,  385, 525, 665, 805,  945, 1085, 1225; 9   | 117,  273,  429, 585, 741, 897, 1053, 1209, 1365, 1521; ..... MATHEMATICA t[n_, k_] := (4 n + 3) (4 k + 3); Table[t[n, k], {n, 0, 10}, {k, n}] // Flatten PROG (MAGMA) [(4*n+3)*(4*k+3): k in [0..n], n in [0..15]]; /* or, as triangle: */ [[(4*n+3)*(4*k+3): k in [0..n]]: n in [0..10]]; CROSSREFS Cf. A002145, A004767, A016838, A017629, A085027. Sequence in context: A277715 A173391 A259243 * A133762 A160414 A256530 Adjacent sequences:  A241744 A241745 A241746 * A241748 A241749 A241750 KEYWORD nonn,tabl,easy AUTHOR Vincenzo Librandi, Apr 29 2014 EXTENSIONS Edited by Alois P. Heinz and Bruno Berselli, May 08 2014 STATUS approved

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Last modified September 20 19:02 EDT 2021. Contains 347588 sequences. (Running on oeis4.)