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A070055 Number of Bottleneck-Monge matrices with 7 rows. 8
128, 1375, 10238, 62347, 331561, 1595475, 7102354, 29688844, 117789230, 447095308, 1633583432, 5773429726, 19814156786, 66246078602, 216345953850, 691705334522, 2169266885114, 6684119486458, 20264694041594, 60526805714938, 178299235266554, 518528519151610, 1490041038438394, 4234162281971706, 11906594366685178 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

COMMENTS

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]).

LINKS

Nathaniel Johnston, Table of n, a(n) for n = 1..400

FORMULA

a(N) = a(7, N), where a(P, N) is defined recursively in A070050.

Empirical G.f.: -x*(8192*x^13 -101240*x^12 +472850*x^11 -1238864*x^10 +2119510*x^9 -2555238*x^8 +2264076*x^7 -1508235*x^6 +762058*x^5 -290820*x^4 +82129*x^3 -16377*x^2 +2081*x -128) / ((x -1)*(2*x -1)^13). - Colin Barker, Feb 28 2013

CROSSREFS

Cf. A070050, A070051, A070052, A070053, A070054, A070056, A070057.

Sequence in context: A188822 A181211 A221071 * A247930 A200842 A187706

Adjacent sequences:  A070052 A070053 A070054 * A070056 A070057 A070058

KEYWORD

nonn

AUTHOR

Pascal Prea (pascal.prea(AT)lim.univ-mrs.fr), Apr 18 2002

EXTENSIONS

a(10) - a(25) from Nathaniel Johnston, Apr 13 2011

STATUS

approved

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Last modified October 22 01:48 EDT 2021. Contains 348160 sequences. (Running on oeis4.)