Number of h-cobordism classes of smooth homotopy n-spheres.

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =1a(5) =1a(6) =28a(7) =2a(8) =8a(9) =6a(10) =992a(11) =1a(12) =3a(13) =2a(14) =16256a(15) =2a(16) =16a(17) =16a(18) =523264a(19) =24a(20) =8a(21) =4a(22) =69524373504a(23) =2a(24) =4a(25) =12a(26) =67100672a(27) =2a(28) =3a(29) =3