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 A143311 Triangle read by rows, A127648 * A126988; 1<=k<=n. 2
 1, 4, 2, 9, 0, 3, 16, 8, 0, 4, 25, 0, 0, 0, 5, 36, 18, 12, 0, 0, 6, 49, 0, 0, 0, 0, 0, 7, 64, 32, 0, 16, 0, 0, 0, 8, 81, 0, 27, 0, 0, 0, 0, 0, 9, 100, 50, 0, 0, 20, 0, 0, 0, 0, 10, 121, 0, 0, 0, 0, 0, 0, 0, 0, 0, 11, 144, 72, 48, 36, 0, 24, 0, 0, 0, 0, 0, 12, 169, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 13 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row sums = A064987, n*sigma(n): (1, 6, 12, 28, 30, 72, 56,...). LINKS FORMULA Triangle read by rows, A127648 * A126988; 1<=k<=n EXAMPLE First few rows of the triangle = 1; 4, 2; 9, 0, 3; 16, 8, 0, 4; 25, 0, 0, 0, 5; 36, 18, 12, 0, 0, 6; 49, 0, 0, 0, 0, 0, 7; 64, 32, 0, 16, 0, 0, 0, 8; ... CROSSREFS Cf. A127648, A126988, A064987. Sequence in context: A046589 A072562 A190477 * A016696 A127470 A199449 Adjacent sequences:  A143308 A143309 A143310 * A143312 A143313 A143314 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Aug 06 2008 STATUS approved

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Last modified June 1 19:32 EDT 2020. Contains 334762 sequences. (Running on oeis4.)