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 A216219 Square array T, read by antidiagonals: T(n,k) = 0 if n-k>=5 or if k-n>=5, T(4,0) = T(3,0) = T(2,0) = T(1,0) = T(0,0) = T(0,1) = T(0,2) = T(0,3) = T(0,4) = 1, T(n,k) = T(n-1,k) + T(n,k-1). 10
 1, 1, 1, 1, 2, 1, 1, 3, 3, 1, 1, 4, 6, 4, 1, 0, 5, 10, 10, 5, 0, 0, 5, 15, 20, 15, 5, 0, 0, 0, 20, 35, 35, 20, 0, 0, 0, 0, 20, 55, 70, 55, 20, 0, 0, 0, 0, 0, 75, 125, 125, 75, 0, 0, 0, 0, 0, 0, 75, 200, 250, 200 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,5 LINKS Table of n, a(n) for n=0..61. FORMULA T(n,n) = A147748(n). T(n+1,n) = T(n,n+1) = A081567(n). T(n+2,n) = T(n,n+2) = A039717(n+1). T(n+3,n) = T(n+4,n) = T(n,n+3) = T(n,n+4) = A030191(n). Sum_{k, 0<=k<=n} T(n-k,k) = A068913(4,n) = A216212(n). EXAMPLE Square array begins: 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, ... 1, 2, 3, 4, 5, 5, 0, 0, 0, 0, 0, ... 1, 3, 6, 10, 15, 20, 20, 0, 0, 0, 0, ... 1, 4, 10, 20, 35, 55, 75, 75, 0, 0, 0, ... 1, 5, 15, 35, 70, 125, 200, 275, 275, 0, 0, ... 0, 5, 20, 55, 125, 250, 450, 725, 1000, 1000, 0, ... 0, 0, 20, 75, 200, 450, 900, ... CROSSREFS Cf. A030191, A039717, A068913, A081567, A147748, A216210, A216212, A216218 Sequence in context: A055216 A216236 A217770 * A180181 A128629 A107065 Adjacent sequences: A216216 A216217 A216218 * A216220 A216221 A216222 KEYWORD nonn,tabl AUTHOR Philippe Deléham, Mar 13 2013 STATUS approved

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Last modified May 20 05:07 EDT 2024. Contains 372703 sequences. (Running on oeis4.)