%I M4856 #23 Feb 28 2023 22:25:02
%S 1,12,103,736,4571,25326,127415,588687,2518997,10053739,37656707,
%T 133084998,445949359,1422934989,4340110439,12697803333,35744330644,
%U 97081519369,255032046536,649459943602,1606518048420,3867119228081,9073566868140,20783186834063
%N Number of n-covers of an unlabeled 5-set.
%C Number of n X 5 binary matrices with at least one 1 in every column up to row and column permutations. - _Andrew Howroyd_, Feb 28 2023
%D R. J. Clarke, Covering a set by subsets, Discrete Math., 81 (1990), 147-152.
%D N. J. A. Sloane and Simon Plouffe, The Encyclopedia of Integer Sequences, Academic Press, 1995 (includes this sequence).
%H Andrew Howroyd, <a href="/A005771/b005771.txt">Table of n, a(n) for n = 1..1000</a>
%H Vladeta Jovovic, <a href="/A005748/a005748.pdf">Binary matrices up to row and column permutations</a>
%F a(n) = A052264(n) - A006148(n). - _Andrew Howroyd_, Feb 28 2023
%o (PARI) Vec(G(5, x) - G(4, x) + O(x^40)) \\ G defined in A028657. - _Andrew Howroyd_, Feb 28 2023
%Y A diagonal of A055080.
%Y First differences give A055083.
%Y Cf. A006148, A052264.
%K nonn
%O 1,2
%A _N. J. A. Sloane_, _Simon Plouffe_
%E More terms from _Vladeta Jovovic_, Jun 13 2000
%E Terms a(21) and beyond from _Andrew Howroyd_, Feb 28 2023