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 A130127 Triangle defined by A000012 * A130125, read by rows. 2
 1, 1, 2, 2, 2, 4, 2, 4, 4, 8, 3, 4, 8, 8, 16, 3, 6, 8, 16, 16, 32, 4, 6, 12, 16, 32, 32, 64, 4, 8, 12, 24, 32, 64, 64, 128, 5, 8, 16, 24, 48, 64, 128, 128, 256, 5, 10, 16, 32, 48, 96, 128, 256, 256, 512, 6, 10, 20, 32, 64, 96, 192, 256, 512, 512, 1024, 6, 12, 20, 40, 64, 128, 192, 384, 512, 1024, 1024, 2048 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,3 COMMENTS Row sums = A011377: (1, 3, 8, 18, 39, ...). A130126 = A130125 * A000012. LINKS G. C. Greubel, Rows n = 1..100 of triangle, flattened FORMULA T(n,k) = 2^(k-1) * floor((n-k+2)/2). - G. C. Greubel, Jun 06 2019 EXAMPLE First few rows of the triangle: 1; 1, 2; 2, 2, 4; 2, 4, 4, 8; 3, 4, 8, 8, 16; 3, 6, 8, 16, 16, 32; 4, 6, 12, 16, 32, 32, 64; ... MATHEMATICA Table[2^(k-1)*Floor[(n-k+2)/2], {n, 1, 12}, {k, 1, n}]//Flatten (* G. C. Greubel, Jun 06 2019 *) PROG (PARI) {T(n, k) = 2^(k-1)*floor((n-k+2)/2)}; \\ G. C. Greubel, Jun 06 2019 (Magma) [[2^(k-1)*Floor((n-k+2)/2): k in [1..n]]: n in [1..12]]; // G. C. Greubel, Jun 06 2019 (Sage) [[2^(k-1)*floor((n-k+2)/2) for k in (1..n)] for n in (1..12)] # G. C. Greubel, Jun 06 2019 CROSSREFS Cf. A000012, A130125, A130126, A011377. Sequence in context: A330772 A105681 A240039 * A217982 A184727 A342457 Adjacent sequences: A130124 A130125 A130126 * A130128 A130129 A130130 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, May 11 2007 EXTENSIONS More terms added by G. C. Greubel, Jun 06 2019 STATUS approved

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Last modified December 6 03:23 EST 2022. Contains 358594 sequences. (Running on oeis4.)