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 A116948 Riordan array ((1+2x^2)/(1-x^3),x). 1
 1, 0, 1, 2, 0, 1, 1, 2, 0, 1, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 1, 2, 0, 1, 2, 0, 1, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1 (list; table; graph; refs; listen; history; text; internal format)
 OFFSET 0,4 COMMENTS Row sums are A117571. Diagonal sums are A117572. Inverse is A116949. LINKS FORMULA Number triangle T(n,k)=2*J(L((n-k+2)/3))[k<=n] where L(j/p) is the Legendre symbol of j and p and J(n)=A001045(n) EXAMPLE Triangle begins 1, 0, 1, 2, 0, 1, 1, 2, 0, 1, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 1, 2, 0, 1, 2, 0, 1, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1, 2, 0, 1 CROSSREFS Sequence in context: A077614 A280379 A180793 * A101660 A276771 A062984 Adjacent sequences:  A116945 A116946 A116947 * A116949 A116950 A116951 KEYWORD easy,nonn,tabl AUTHOR Paul Barry, Mar 29 2006 STATUS approved

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Last modified October 14 09:57 EDT 2019. Contains 327995 sequences. (Running on oeis4.)