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 A350488 Triangle read by rows: T(n,k) is the number of acyclic digraphs on n unlabeled nodes with k arcs and a global source, n >= 1, k = 0..n*(n-1)/2. 5
 1, 0, 1, 0, 0, 2, 1, 0, 0, 0, 4, 6, 5, 1, 0, 0, 0, 0, 9, 25, 47, 46, 27, 9, 1, 0, 0, 0, 0, 0, 20, 95, 297, 582, 783, 738, 501, 235, 75, 14, 1, 0, 0, 0, 0, 0, 0, 48, 337, 1575, 4941, 11295, 19404, 25847, 26966, 22195, 14380, 7280, 2831, 816, 165, 20, 1 (list; graph; refs; listen; history; text; internal format)
 OFFSET 1,6 LINKS Andrew Howroyd, Table of n, a(n) for n = 1..1350 (rows 1..20) EXAMPLE Triangle begins:   [1] 1;   [2] 0, 1;   [3] 0, 0, 2, 1;   [4] 0, 0, 0, 4, 6,  5,  1;   [5] 0, 0, 0, 0, 9, 25, 47, 46, 27, 9, 1;   [6] 0, 0, 0, 0, 0, 20, 95, 297, 582, 783, 738, 501, 235, 75, 14, 1;   ... PROG (PARI) \\ See PARI link in A122078 for program code. { my(A=A350488rows(7)); for(i=1, #A, print(A[i])) } CROSSREFS Row sums are A350415. Column sums are A350490. Leading diagonal is A000081. The labeled version is A350487. Cf. A122078, A350447, A350449, A350491. Sequence in context: A326453 A130116 A325774 * A212868 A184616 A261139 Adjacent sequences:  A350485 A350486 A350487 * A350489 A350490 A350491 KEYWORD nonn,tabf AUTHOR Andrew Howroyd, Jan 01 2022 STATUS approved

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Last modified August 16 21:38 EDT 2022. Contains 356169 sequences. (Running on oeis4.)