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 A216182 Riordan array ((1+x)/(1-x)^2, x(1+x)^2/(1-x)^2). 2
 1, 3, 1, 5, 7, 1, 7, 25, 11, 1, 9, 63, 61, 15, 1, 11, 129, 231, 113, 19, 1, 13, 231, 681, 575, 181, 23, 1, 15, 377, 1683, 2241, 1159, 265, 27, 1, 17, 575, 3653, 7183, 5641, 2047, 365, 31, 1, 19, 833, 7183, 19825, 22363, 11969, 3303, 481, 35, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Triangle formed of odd-numbered columns of the Delannoy triangle A008288. LINKS FORMULA T(2n, n) = A108448(n+1). Sum_{k, 0<=k<=n} T(n,k) = A073717(n+1). EXAMPLE Triangle begins 1 3, 1 5, 7, 1 7, 25, 11, 1 9, 63, 61, 15, 1 11, 129, 231, 113, 19, 1 13, 231, 681, 575, 181, 23, 1 15, 377, 1683, 2241, 1159, 265, 27, 1 17, 575, 3653, 7183, 5641, 2047, 365, 31, 1 ... CROSSREFS Cf. (columns:) A005408, A001845, A001847, A001849, A008419. Cf. Diagonals: A000012, A004767, A060820. Cf. A008288 (Delannoy triangle), A114123 (even-numbered columns of A008288). Sequence in context: A320904 A193844 A201552 * A143524 A134249 A188509 Adjacent sequences:  A216179 A216180 A216181 * A216183 A216184 A216185 KEYWORD nonn,tabl AUTHOR Philippe Deléham, Mar 11 2013 STATUS approved

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Last modified October 16 21:10 EDT 2019. Contains 328103 sequences. (Running on oeis4.)