Number of isomorphism classes of linking pairings on finite Abelian 2-groups of fixed order 2^n.

Terms

a(0) =1a(1) =4a(2) =6a(3) =14a(4) =20a(5) =43a(6) =59a(7) =108a(8) =158a(9) =265a(10) =373a(11) =600a(12) =838a(13) =1301a(14) =1797a(15) =2693a(16) =3695a(17) =5379a(18) =7291a(19) =10407a(20) =14023a(21) =19651a(22) =26227a(23) =36166a(24) =47888a(25) =65193a(26) =85731a(27) =115308a(28) =150598a(29) =200420