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 A067802 Triangle with T(n,k)=C(2n+1,n-k)^2*(2k+1)/(2n+1). 0
 1, 3, 1, 20, 15, 1, 175, 189, 35, 1, 1764, 2352, 720, 63, 1, 19404, 29700, 12375, 1925, 99, 1, 226512, 382239, 196625, 44044, 4212, 143, 1, 2760615, 5010005, 3006003, 869505, 124215, 8085, 195, 1, 34763300, 66745536, 45048640, 15767024, 2998800 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 LINKS Table of n, a(n) for n=0..40. FORMULA a(n) =A034869(2n+1, k)*A039599(n, k). Row sums are C(2n, n)^2=A002894(n). EXAMPLE Rows are: 1; 3,1; 20,15,1; 175,189,35,1; etc. T(3,1)=C(7,2)^2*3/7=21^2*3/7=189. CROSSREFS First column is A000891. Sequence in context: A374651 A038455 A343890 * A181832 A139723 A030042 Adjacent sequences: A067799 A067800 A067801 * A067803 A067804 A067805 KEYWORD nonn,tabl AUTHOR Henry Bottomley, Feb 07 2002 STATUS approved

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Last modified September 9 20:39 EDT 2024. Contains 375765 sequences. (Running on oeis4.)