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 A106187 Sequence array for central binomial numbers A000984. 3
 1, 2, 1, 6, 2, 1, 20, 6, 2, 1, 70, 20, 6, 2, 1, 252, 70, 20, 6, 2, 1, 924, 252, 70, 20, 6, 2, 1, 3432, 924, 252, 70, 20, 6, 2, 1, 12870, 3432, 924, 252, 70, 20, 6, 2, 1, 48620, 12870, 3432, 924, 252, 70, 20, 6, 2, 1, 184756, 48620, 12870, 3432, 924, 252, 70, 20, 6, 2, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,2 COMMENTS Row sums are A006134. Diagonal sums are A106188. The matrix inverse starts 1; -2,1; -2,-2,1; -4,-2,-2,1; -10,-4,-2,-2,1; -28,-10,-4,-2,-2,1; -84,-28,-10,-4,-2,-2,1; -264,-84,-28,-10,-4,-2,-2,1; -858,-264,-84,-28,-10,-4,-2,-2,1; apparently related to A002420. - R. J. Mathar, Apr 08 2013 LINKS FORMULA Number triangle T(n, k)=binomial(2(n-k), n-k); Riordan array (1/sqrt(1-4x), x). EXAMPLE Table begins 1; 2,1; 6,2,1; 20,6,2,1; 70,20,6,2,1; MAPLE A106187 := proc(n, k)     binomial(2*(n-k), n-k) ; end proc: # R. J. Mathar, Apr 08 2013 CROSSREFS Sequence in context: A101024 A124730 A114283 * A110135 A114423 A335109 Adjacent sequences:  A106184 A106185 A106186 * A106188 A106189 A106190 KEYWORD easy,nonn,tabl AUTHOR Paul Barry, Apr 24 2005 STATUS approved

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Last modified August 15 16:02 EDT 2020. Contains 336505 sequences. (Running on oeis4.)