OFFSET
0,2
COMMENTS
FORMULA
PROG
(PARI) {a(n)=local(B); B=0; if(n==0, B=1, for(k=0, n-1, B=bitxor(B, binomial(n-1-k+k\2, k\2)%2*2^(k+1)))); B}
CROSSREFS
KEYWORD
eigen,nonn
AUTHOR
Paul D. Hanna, Oct 30 2004
STATUS
approved