A091949 a(n) = A087659(n) mod 2.

1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 0, 1, 1, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1, 0, 1, 1, 1, 1, 0, 0, 1

Offset

0,1

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 2; a(8k)=1, a(8k+1)=0, a(8k+2)=1 a(8k+3)=0, a(8k+4)=0, a(8k+5)= 035263(k+1), a(8k+6)=1-035263(k+1), a(8k+7)=A035263(k+1)

Prog

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

Crossrefs

Sequence in context: A181656 A090971 A105594 * A039984 A153639 A319102

Adjacent sequences: A091946 A091947 A091948 * A091950 A091951 A091952

Keyword

nonn

Author

Benoit Cloitre, Mar 11 2004

Status

approved