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 A124279 Riordan array (1/(1-x),x(1-x+x^2)/(1-x)). 2
 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 3, 3, 1, 1, 1, 4, 5, 4, 1, 1, 1, 5, 8, 7, 5, 1, 1, 1, 6, 12, 13, 9, 6, 1, 1, 1, 7, 17, 22, 19, 11, 7, 1, 1, 1, 8, 23, 35, 35, 26, 13, 8, 1, 1, 1, 9, 30, 53 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,8 COMMENTS Row sums are A005314. Diagonal sums are A124280. T(2n,n) is A002426. Reversal of A124445. - Paul Barry, Nov 01 2006 LINKS FORMULA Number triangle T(n,k)=sum{j=0..n-k, C(j,n-k-j)C(k,n-k-j)} EXAMPLE Triangle begins 1, 1, 1, 1, 1, 1, 1, 2, 1, 1, 1, 3, 3, 1, 1, 1, 4, 5, 4, 1, 1, 1, 5, 8, 7, 5, 1, 1 CROSSREFS Sequence in context: A096815 A193516 A124445 * A297299 A135225 A208891 Adjacent sequences:  A124276 A124277 A124278 * A124280 A124281 A124282 KEYWORD easy,nonn,tabl AUTHOR Paul Barry, Oct 24 2006 STATUS approved

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Last modified April 13 11:56 EDT 2021. Contains 342936 sequences. (Running on oeis4.)