A209606 Number of nX4 1..2 arrays with every element value z a city block distance of exactly z from another element value z

2, 45, 955, 11879, 151736, 1947347, 24912066, 322047969, 4162324219, 53725706448, 693454797025, 8950269164167, 115522311347383, 1491104128677150, 19246371866665817, 248421180186787884, 3206476873520078239

Offset

1,1

Comments

Column 4 of A209610

Links

R. H. Hardin, Table of n, a(n) for n = 1..210

Example

Some solutions for n=4
..1..1..1..2....1..1..1..2....2..2..2..2....1..1..2..2....2..2..2..1
..2..2..2..2....1..1..2..1....2..2..2..1....1..2..2..2....2..2..1..1
..2..2..2..1....1..1..2..1....2..1..2..1....1..2..2..1....1..2..2..2
..2..1..1..1....1..2..2..2....1..1..2..1....1..2..2..1....1..2..2..2

Crossrefs

Sequence in context: A222997 A092654 A374863 * A100101 A332244 A090601

Adjacent sequences: A209603 A209604 A209605 * A209607 A209608 A209609

Keyword

nonn

Author

R. H. Hardin Mar 10 2012

Status

approved