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 A143593 Triangle read by rows, square of A238303 (an infinite lower triangular matrix with 1's in the first column and the rest 2's). 1
 1, 3, 4, 5, 8, 4, 7, 12, 8, 4, 9, 16, 12, 8, 4, 11, 20, 16, 12, 8, 4, 13, 24, 20, 16, 12, 8, 4, 15, 28, 24, 20, 16, 12, 8, 4, 17, 32, 28, 24, 20, 16, 12, 8, 4, 19, 36, 32, 28, 24, 20, 16, 12, 8, 4 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 1,2 COMMENTS Row sums = A056220 starting with offset 1: (1, 7, 17, 31, 49, 71, 97,...). LINKS Table of n, a(n) for n=1..55. FORMULA Triangle read by rows, square of an infinite lower triangular matrix with 1's in the first column and the rest 2's. Square of (A000012 * (S(k) * 0^(n-k)), 1<=k<=n EXAMPLE The square of the infinite lower triangular matrix (1; 1,2; 1,2,2;...) = 1; 3, 4; 5, 8, 4; 7, 12, 8, 4; 9, 16, 12, 8, 4; 11, 20, 16, 12, 8, 4; 13, 24, 20, 16, 12, 8, 4; ... CROSSREFS Cf. A056220, A238303. Sequence in context: A325410 A269719 A214626 * A364089 A028267 A364063 Adjacent sequences: A143590 A143591 A143592 * A143594 A143595 A143596 KEYWORD nonn,tabl AUTHOR Gary W. Adamson & Roger L. Bagula, Aug 26 2008 STATUS approved

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Last modified December 3 18:21 EST 2023. Contains 367540 sequences. (Running on oeis4.)