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

Author

Clark Kimberling, Mar 16 2012

Keywords

• nonn

Comments

See A210000 for a guide to related sequences.

Links

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

Crossrefs

Cf. A210000.

Programs

Mathematica

(See the Mathematica section at A210000.)

Formula

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