94035domain: NAppears in sequencesLeft diagonal of partition triangle A047812.at n=21A007044a(n) = a(n-1) XOR Sum_{k=1..n-1} a(k), with a(1)=1, a(2)=3, where XOR is the binary exclusive OR operation.at n=16A099811Volume of torus (rounded down) with major radius = n and minor radius = n/3.at n=34A228641