A209212 Number of nX1 1..7 arrays with every element value z a city block distance of exactly z from another element value z

0, 1, 1, 3, 3, 16, 24, 114, 202, 763, 1401, 4515, 9434, 27254, 63839, 176658, 434102, 1150983, 2879410, 7477003, 18723697, 48021192, 121277594, 311110891, 788523859, 2015924491, 5129396865, 13105869640, 33306947102, 84824346802, 215681934014

Offset

1,4

Comments

Column 1 of A209215

Links

R. H. Hardin, Table of n, a(n) for n = 1..78

Example

All solutions for n=6
..5....1....5....1....1....2....3....4....4....2....5....3....4....2....2....3
..2....1....3....1....1....2....1....1....4....2....1....3....2....3....4....4
..2....2....1....1....3....2....1....1....1....2....1....3....3....2....2....2
..2....2....1....1....1....2....3....2....1....2....1....3....2....2....1....3
..2....2....3....1....1....1....1....4....4....2....1....3....4....3....1....2
..5....2....5....1....3....1....1....2....4....2....5....3....3....2....4....4

Crossrefs

Sequence in context: A258204 A258017 A209055 * A222847 A278309 A048234

Adjacent sequences: A209209 A209210 A209211 * A209213 A209214 A209215

Keyword

nonn

Author

R. H. Hardin Mar 06 2012

Status

approved