Number of conjugacy classes of pairs of commuting elements in the alternating group A_n.

Terms

a(0) =1a(1) =1a(2) =9a(3) =14a(4) =22a(5) =44a(6) =74a(7) =160a(8) =256a(9) =462a(10) =817a(11) =1494a(12) =2543a(13) =4427a(14) =7699a(15) =13352a(16) =22616a(17) =38610a(18) =65052a(19) =110004a(20) =182961a(21) =305007a(22) =503299a(23) =830648a(24) =1356227a(25) =2212790a(26) =3583419a(27) =5790836