A209973 Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant 2.

0, 0, 12, 20, 36, 52, 76, 100, 132, 156, 204, 244, 276, 324, 396, 428, 492, 556, 628, 700, 764, 812, 932, 1020, 1084, 1164, 1308, 1380, 1476, 1588, 1684, 1804, 1932, 2012, 2204, 2300, 2396, 2540, 2756, 2852, 2980, 3140, 3284, 3452, 3612, 3708

Offset

0,3

Comments

See A210000 for a guide to related sequences.

Links

Chai Wah Wu, Table of n, a(n) for n = 0..10000

Formula

a(n) = A197168(n) + 4*n + 2 for n >= 2. - Chai Wah Wu, Nov 28 2016

Mathematica

(See the Mathematica section at A210000.)

Crossrefs

Cf. A210000.

Sequence in context: A187766 A260905 A211415 * A282754 A063690 A229355

Adjacent sequences: A209970 A209971 A209972 * A209974 A209975 A209976

Keyword

nonn

Author

Clark Kimberling, Mar 16 2012

Status

approved