A223451 Number of idempotent 2X2 -n..n matrices of rank 1

10, 26, 42, 58, 74, 106, 122, 138, 154, 186, 202, 234, 250, 282, 314, 330, 346, 378, 394, 426, 458, 490, 506, 538, 554, 586, 602, 634, 650, 714, 730, 746, 778, 810, 842, 874, 890, 922, 954, 986, 1002, 1066, 1082, 1114, 1146, 1178, 1194, 1226, 1242, 1274, 1306, 1338

Offset

1,1

Comments

Row 2 of A223450

Links

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

Example

Some solutions for n=3
.-2..2....1..0....1.-1....1.-3....0.-1....3.-2...-1.-2....0..0....1..3....2..1
.-3..3...-1..0....0..0....0..0....0..1....3.-2....1..2....1..1....0..0...-2.-1

Crossrefs

Sequence in context: A186279 A054315 A113770 * A229309 A044452 A299409

Adjacent sequences: A223448 A223449 A223450 * A223452 A223453 A223454

Keyword

nonn

Author

R. H. Hardin Apr 09 2013

Status

approved