M. A. Harrison, On the classification of Boolean functions by the general linear and affine groups, J. Soc. Industrial and Applied Mathematics, 12.2 (1964), 285-299. [This journal later became the SIAM Journal]
M. A. Harrison, On asymptotic estimates in switching and automata theory. J. Assoc. Comput. Mach. 13 1966, 151-157.
V. Jovovic, The cycle indices polynomials of some classical groups, Belgrade, 1995, unpublished.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).
Kenny Lau, Table of n, a(n) for n = 1..10
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 the classification of Boolean functions by the general linear and affine groups, Technical Note, (1962).
Vladeta Jovovic, Cycle indices
Index entries for sequences related to Boolean functions