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 A143595 Triangle read by rows, A000012 * (an infinite lower triangular matrix with 1's in the first column and the rest 2's); 1<=k<=n. 3
 1, 2, 2, 3, 4, 2, 4, 6, 4, 2, 5, 8, 6, 4, 2, 6, 10, 8, 6, 4, 2, 7, 12, 10, 8, 6, 4, 2, 8, 14, 12, 10, 8, 6, 4, 2, 9, 16, 14, 12, 10, 8, 6, 4, 2, 10, 18, 16, 14, 12, 10, 8, 6, 4, 2, 11, 20, 18, 16, 14, 12, 10, 8, 6, 4, 2 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row sums = n^2. The linear sequence A056944 is more appropriately a triangle, (reversal of A143595). LINKS FORMULA Triangle read by rows, A000012 * (an infinite lower triangular matrix with 1's in the first column and the rest 2's); i.e. (1; 1,2; 1,2,2;...). A000012 = an infinite lower triangular matrix with all 1's. 1<=k<=n EXAMPLE First few rows of the triangle = 1; 2, 2; 3, 4, 2; 4, 6, 4, 2; 5, 8, 6, 4, 2; 6, 10, 8, 6, 4, 2; 7, 12, 10, 8, 6, 4, 2; ... CROSSREFS Cf. A056944. Sequence in context: A238971 A194331 A290600 * A211702 A208521 A209570 Adjacent sequences:  A143592 A143593 A143594 * A143596 A143597 A143598 KEYWORD nonn,tabl AUTHOR Gary W. Adamson, Aug 26 2008 STATUS approved

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Last modified May 12 09:53 EDT 2021. Contains 343821 sequences. (Running on oeis4.)