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A055082 Number of 4 X n binary matrices with no zero rows or columns, up to row and column permutation. 3
1, 8, 42, 179, 633, 2001, 5745, 15274, 38000, 89331, 199715, 427184, 878152, 1741964, 3345562, 6239390, 11327863, 20065972, 34747460, 58924066, 98002370, 160086580, 257148244, 406637336, 633669040, 973971441, 1477810227, 2215179768, 3282598034, 4811946882 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,2

LINKS

Andrew Howroyd, Table of n, a(n) for n = 1..1000

F. Harary, L. March and R. W. Robinson, On enumerating certain design problems in terms of bicolored graphs with no isolates, Environment and Planning, B 5 (1978), 31-43.

F. Harary, L. March and R. W. Robinson, On enumerating certain design problems in terms of bicolored graphs with no isolates, Environment and Planning B: Urban Analytics and City Science, 5 (1978), 31-43. [Annotated scanned copy]

CROSSREFS

Column k=4 of A056152.

Cf. A024206, A055609, A054976, A048291.

Sequence in context: A287221 A119965 A229729 * A266940 A212337 A289031

Adjacent sequences:  A055079 A055080 A055081 * A055083 A055084 A055085

KEYWORD

nonn

AUTHOR

Vladeta Jovovic, Jun 13 2000

EXTENSIONS

Terms a(21) and beyond from Andrew Howroyd, Mar 25 2020

STATUS

approved

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Last modified December 8 01:25 EST 2021. Contains 349590 sequences. (Running on oeis4.)