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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
OFFSET
0,3
COMMENTS
See A210000 for a guide to related sequences.
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
KEYWORD
nonn
AUTHOR
Clark Kimberling, Mar 16 2012
STATUS
approved