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A091950 a(n) = A087659(n) mod 3. 0
1, 0, 0, 2, 1, 1, 2, 1, 1, 1, 0, 0, 2, 1, 1, 2, 2, 2, 1, 0, 0, 2, 1, 1, 0, 0, 0, 1, 0, 0, 2, 1, 1, 2, 1, 1, 1, 0, 0, 2, 1, 1, 2, 2, 2, 1, 0, 0, 2, 1, 1, 0, 1, 1, 1, 0, 0, 2, 1, 1, 2, 1, 1, 1, 0, 0, 2, 1, 1, 2, 2, 2, 1, 0, 0, 2, 1, 1, 2, 1, 1, 1, 0, 0, 2, 1, 1, 2, 1, 1, 1, 0, 0, 2, 1, 1, 2, 2, 2, 1, 0, 0, 2, 1, 1 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

LINKS

Table of n, a(n) for n=0..104.

FORMULA

a(n)=hypergeom([ -n, (n+4)/2, (n+5)/2], [3, 2], -4) mod 3; a(9k)=1, a(9k+1)=0, a(9k+2)=0, a(9k+3)=2, a(9k+4)=1, a(9k+5)=1, a(9k+6)=2*A014578(k+1), a(9k+7)=z(k), a(9k+8)=z(k) where : z(9k)=1, z(9k+1)=2, z(9k+2)=0, z(9k+3)=1, z(9k+4)=2, z(9k+5)=1, z(9k+6)=1, z(9k+7)=2 and z(9k+8)=z(k).

PROG

(PARI) a(n)= sum(i=0, n, 2*binomial(n, i)*(n+2*i+3)!/((i+1)!*(i+2)!*(n+3)!))%3

CROSSREFS

Sequence in context: A143158 A308424 A317489 * A014750 A015491 A015776

Adjacent sequences:  A091947 A091948 A091949 * A091951 A091952 A091953

KEYWORD

nonn

AUTHOR

Benoit Cloitre, Mar 11 2004

STATUS

approved

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Last modified April 1 14:52 EDT 2020. Contains 333163 sequences. (Running on oeis4.)