OFFSET
1,2
COMMENTS
This seems to be the same as A026200. - Colin Barker, Oct 15 2019
PROG
(PARI) \\ here S is A026177 as vector.
S(n)={my(a=vector(n)); a[1]=1; for(i=2, 2*n, my(h=i\2); if(i%2==0&&!a[i-h], a[i-h]=i, if(i+h<=n, a[i+h]=i))); a}
{[(k + 2)/3 | k<-S(500), k%3==1]} \\ Andrew Howroyd, Oct 15 2019
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
STATUS
approved