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A117198 Generalized Riordan array (1,x)+(x,x^2)+(x^2,x^3). 2
1, 1, 1, 1, 0, 1, 0, 1, 0, 1, 0, 0, 0, 0, 1, 0, 1, 1, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 0, 1, 0, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 1, 0, 1, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0, 1 (list; table; graph; refs; listen; history; text; internal format)
OFFSET
0,1
COMMENTS
Row sums are A083039. Diagonal sums are A117199. Inverse is A117200.
LINKS
FORMULA
Number triangle T(n,k)=if(n=k,1,0) OR if(n=2k+1,1,0) OR if(n=3k+2,1,0).
EXAMPLE
Triangle begins
1,
1, 1,
1, 0, 1,
0, 1, 0, 1,
0, 0, 0, 0, 1,
0, 1, 1, 0, 0, 1,
0, 0, 0, 0, 0, 0, 1,
0, 0, 0, 1, 0, 0, 0, 1,
0, 0, 1, 0, 0, 0, 0, 0, 1,
0, 0, 0, 0, 1, 0, 0, 0, 0, 1,
0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1
CROSSREFS
Sequence in context: A115952 A115524 A370122 * A271047 A054525 A174852
KEYWORD
easy,nonn,tabl
AUTHOR
Paul Barry, Mar 02 2006
STATUS
approved

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Last modified March 19 03:33 EDT 2024. Contains 370952 sequences. (Running on oeis4.)