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A210002 Number of 2 X 2 matrices having all elements in {1,2,...,n} and determinant 4. 3
0, 0, 0, 4, 16, 26, 44, 62, 104, 122, 164, 198, 256, 298, 364, 390, 480, 538, 604, 670, 792, 834, 948, 1030, 1120, 1194, 1332, 1398, 1584, 1690, 1780, 1894, 2080, 2154, 2340, 2430, 2616, 2754, 2964, 3054, 3240, 3394, 3532, 3694, 4008, 4098 (list; graph; refs; listen; history; text; internal format)
OFFSET

0,4

COMMENTS

See A210000 for a guide to related sequences.

LINKS

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

MATHEMATICA

(See the Mathematica section at A209978.)

CROSSREFS

Cf. A210000.

Sequence in context: A295921 A111350 A223221 * A105078 A050707 A046346

Adjacent sequences:  A209999 A210000 A210001 * A210003 A210004 A210005

KEYWORD

nonn

AUTHOR

Clark Kimberling, Mar 16 2012

STATUS

approved

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Last modified February 20 04:49 EST 2020. Contains 332063 sequences. (Running on oeis4.)