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A216230 Square array T, read by antidiagonals: T(n,k) = 0 if n-k>=1 or if k-n>=2, T(0,0) = T(0,1) = 1, T(n,k) = T(n-1,k) + T(n,k-1). 10
1, 1, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0 (list; table; graph; refs; listen; history; text; internal format)
OFFSET

0,1

LINKS

Table of n, a(n) for n=0..69.

FORMULA

T(n,n) = T(n,n+1) = 1.

Sum_{k, 0<=k<=n} T(n-k, k) = 1.

EXAMPLE

Square array begins:

1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, ...

0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, ...

0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, 0, ...

0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, 0, ...

0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, 0, ...

0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, 0, ...

0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, 0, ...

0, 0, 0, 0, 0, 0, 0, 1, 1, 0, 0, 0, ...

...

CROSSREFS

Cf. A000012, A068914

Cf. Similar sequences: A216201, A216210, A216216, A216218, A216219, A216220, A216226, A216228, A216229

Sequence in context: A118009 A113429 A133100 * A077606 A004601 A267418

Adjacent sequences:  A216227 A216228 A216229 * A216231 A216232 A216233

KEYWORD

nonn,tabl

AUTHOR

Philippe Deléham, Mar 14 2013

STATUS

approved

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Last modified November 16 19:17 EST 2019. Contains 329201 sequences. (Running on oeis4.)