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 A143271 Triangle read by rows, A130209 * A000012 * A127648, 1<=k<=n. 1
 1, 2, 4, 2, 4, 6, 3, 6, 9, 12, 2, 4, 6, 8, 10, 4, 8, 12, 16, 20, 24, 2, 4, 6, 8, 10, 12, 14, 4, 8, 12, 16, 20, 24, 28, 32, 3, 6, 9, 12, 15, 18, 21, 24, 27, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 2, 4, 6, 8, 10, 12, 146, 16, 18, 20, 22, 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row sums = A143272: (1, 6, 12, 30, 30, 84, 56,...). Left border = A000005: (1, 2, 2, 3, 2, 4, 2, 4, 3,...). LINKS FORMULA Triangle read by rows, A130209 * A000012 * A127648, 1<=k<=n. T(n,k) = d(n)*k EXAMPLE First few rows of the triangle = 1; 2, 4; 2, 4, 6; 3, 6, 9, 12; 2, 4, 6, 8, 10; 4, 8, 12, 16, 20, 24; 2, 4, 6, 8, 10, 12, 14; ... T(5,3) = 6 = 2*3 = d(5)*3 CROSSREFS Cf. A000005, A143272, A130209, A127648. Sequence in context: A214781 A214850 A236186 * A267654 A128859 A047975 Adjacent sequences:  A143268 A143269 A143270 * A143272 A143273 A143274 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Aug 03 2008 STATUS approved

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Last modified February 25 08:21 EST 2020. Contains 332221 sequences. (Running on oeis4.)