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A361582 Triangle read by rows: T(n,k) is the number of digraphs on n unlabeled nodes with k strongly connected components.

%I A361582 #8 Mar 16 2023 19:46:40
%S A361582 1,0,1,0,1,2,0,5,5,6,0,83,62,42,31,0,5048,2494,1172,592,302,0,1047008,
%T A361582 330063,103961,38312,15616,5984,0,705422362,137934757,28095923,
%U A361582 7243110,2297690,795930,243668,0,1580348371788,184557780045,23226116293,3951426731,914429926,261269562,79512478,20286025
%N A361582 Triangle read by rows: T(n,k) is the number of digraphs on n unlabeled nodes with k strongly connected components.
%H A361582 Wikipedia, <a href="https://en.wikipedia.org/wiki/Strongly_connected_component">Strongly connected component</a>.
%e A361582 Triangle begins:
%e A361582   1;
%e A361582   0,       1;
%e A361582   0,       1,      2;
%e A361582   0,       5,      5,      6;
%e A361582   0,      83,     62,     42,    31;
%e A361582   0,    5048,   2494,   1172,   592,   302;
%e A361582   0, 1047008, 330063, 103961, 38312, 15616, 5984;
%e A361582   ...
%o A361582 (PARI) \\ See PARI link in A350794 for program code.
%o A361582 { my(A=A361582triang(6)); for(n=1, #A, print(A[n])) }
%Y A361582 Column k=1 is A035512.
%Y A361582 Main diagonal is A003087.
%Y A361582 Row sums are A000273.
%Y A361582 The labeled version is A361455.
%Y A361582 Cf. A106238, A350794, A361587, A361588.
%K A361582 nonn,tabl
%O A361582 0,6
%A A361582 _Andrew Howroyd_, Mar 16 2023