138406domain: NAppears in sequences(1/1 - 1/3 + 1/6 + ... + d/C(n+1,2))*LCM{1,3,6,...,C(n+1,2)}, where d = (-1)^n.at n=13A025559Grundy function for turn-at-most-8-coins game.at n=27A054045Positions of check bits in code in A075943.at n=9A075945