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A047680 Order of cyclic group of diffeomorphism classes of exotic (4n-1)-spheres which bound parallelizable manifolds, for n >= 2. 3

%I

%S 1,28,342736,29398976,22841912576,495449389339648,113828913905979392,

%T 4138783908783021080576,226044736813811127599528869888,

%U 35882867158508587149623987273728,5564179808875681941887049052192768,197363311803624016534960016288517315362816

%N Order of cyclic group of diffeomorphism classes of exotic (4n-1)-spheres which bound parallelizable manifolds, for n >= 2.

%D J. W. Milnor and J. D. Stasheff, Characteristic Classes, Princeton, 1974, p. 285.

%H <a href="/index/Be#Bernoulli">Index entries for sequences related to Bernoulli numbers.</a>

%H John W. Milnor, <a href="http://www.ams.org/notices/201106/rtx110600804p.pdf">Differential Topology Forty-six Years Later</a>, Notices Amer. Math. Soc. 58 (2011), 804-809.

%p (-1)*2^(2*n-2)*(2^(2*n-1)-1)*numer(bernoulli(4*n)/n);

%Y Cf. A001676.

%K nonn

%O 1,2

%A _N. J. A. Sloane_.

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Last modified October 17 08:36 EDT 2019. Contains 328107 sequences. (Running on oeis4.)