V. Jovovic, The cycle indices polynomials of some classical groups, Belgrade, 1995, unpublished.
R. J. Lechner, Harmonic Analysis of Switching Functions, in A. Mukhopadhyay, ed., Recent Developments in Switching Theory, Ac Press, 1971, pp. 121-254, esp. p. 186.
N. J. A. Sloane, A Handbook of Integer Sequences, Academic Press, 1973 (includes this sequence).
N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
Table of n, a(n) for n=1..8.
H. Fripertinger, Cycle indices of linear, affine and projective groups, Linear Algebra and Its Applications, 263, 133-156, 1997.
H. Fripertinger, Implementation of cycle index of linear group
M. A. Harrison, On asymptotic estimates in switching and automata theory, J. ACM, v. 13, no. 1, Jan. 1966, pp. 151-157.
Vladeta Jovovic, Cycle indices
Index entries for sequences related to Boolean functions