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Search: id:A070052
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| A070052 |
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Number of Bottleneck-Monge matrices with 4 rows. In the formula below, P=4. |
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+0
7
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| 16, 87, 384, 1516, 5535, 19030, 62347, 196301, 597725
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OFFSET
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1,1
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COMMENT
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Bottleneck-Monge matrices are {0,1} matrices A in which, for every i<j and k<l, max(A[i,l],A[j,k]) <= max(A[i,k],A[j,l]).
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FORMULA
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a(N, P) = 1 + sum(C(N, n)*C(P, p)*K(p, n)), n=1..N, p=1..P where : C is the binomial coefficient K(p, n) = sum(T(p, n, i)), i=1..n where : T(1, n, 1) = 1 T(1, n, i) = 0 for i>1 T(p, n, i) = sum(K(p-1, j)), j=i..n
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CROSSREFS
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Cf. A070050, A070051, A070053, A070054, A070055, A070056, A070057.
Sequence in context: A053909 A030693 A118675 this_sequence A022676 A035291 A120045
Adjacent sequences: A070049 A070050 A070051 this_sequence A070053 A070054 A070055
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KEYWORD
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nonn
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AUTHOR
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Pascal Prea (pascal.prea(AT)lim.univ-mrs.fr), Apr 18 2002
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