2097176domain: NAppears in sequencesFrom P-positions in a certain game.at n=21A081691a(1) = 5; a(n) is the sum of |a(m) - m| for m < n.at n=22A270841a(n) = [x^n] (1 - 2*x + x^2 - 2*x^3 + x^4)/((1 - x)^2*(1 - 2*x)).at n=23A323227a(n) = Sum_{k=1..n} tau(gcd(k,n))^(n/gcd(k,n)), where tau(n) is the number of divisors of n.at n=33A344195