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A209973 Number of 2 X 2 matrices having all elements in {0,1,...,n} and determinant 2. 4
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 (list; graph; refs; listen; history; text; internal format)
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

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Last modified August 5 08:48 EDT 2021. Contains 346464 sequences. (Running on oeis4.)