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 A130125 Triangle defined by A128174 * A130123, read by rows. 5
 1, 0, 2, 1, 0, 4, 0, 2, 0, 8, 1, 0, 4, 0, 16, 0, 2, 0, 8, 0, 32, 1, 0, 4, 0, 16, 0, 64, 0, 2, 0, 8, 0, 32, 0, 128, 1, 0, 4, 0, 16, 0, 64, 0, 256, 0, 2, 0, 8, 0, 32, 0, 128, 0, 512, 1, 0, 4, 0, 16, 0, 64, 0, 256, 0, 1024, 0, 2, 0, 8, 0, 32, 0, 128, 0, 512, 0, 2048 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,3 COMMENTS Row sums = A000975: (1, 2, 5, 10, 21, 42, ...). LINKS G. C. Greubel, Rows n = 0..100 of triangle, flattened FORMULA A128174 * A130123 as infinite lower triangular matrices. By columns, (2^k, 0, 2^k, 0, ...). T(n,k) = 2^(k-1)*(1 + (-1)^(n-k)). - G. C. Greubel, Jun 05 2019 EXAMPLE First few rows of the triangle are: 1; 0, 2; 1, 0, 4; 0, 2, 0, 8; 1, 0, 4, 0, 16; 0, 2, 0, 8, 0, 32; ... MATHEMATICA Table[2^(k-1)*(1+(-1)^(n-k)), {n, 0, 10}, {k, 0, n}]//Flatten (* G. C. Greubel, Jun 05 2019 *) PROG (PARI) {T(n, k) = 2^(k-1)*(1+(-1)^(n-k))}; \\ G. C. Greubel, Jun 05 2019 (Magma) [[2^(k-1)*(1+(-1)^(n-k)): k in [0..n]]: n in [0..10]]; // G. C. Greubel, Jun 05 2019 (Sage) [[2^(k-1)*(1+(-1)^(n-k)) for k in (0..n)] for n in (0..10)] # G. C. Greubel, Jun 05 2019 (GAP) Flat(List([0..10], n-> List([0..n], k-> 2^(k-1)*(1+(-1)^(n-k)) ))); # G. C. Greubel, Jun 05 2019 CROSSREFS Cf. A000975, A128174, A130123. Sequence in context: A363032 A185964 A143424 * A336517 A317552 A214809 Adjacent sequences: A130122 A130123 A130124 * A130126 A130127 A130128 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, May 11 2007 EXTENSIONS More terms added by G. C. Greubel, Jun 05 2019 STATUS approved

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Last modified December 5 14:39 EST 2023. Contains 367592 sequences. (Running on oeis4.)