A209990 - OEIS

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A209990

Number of 2 X 2 matrices having all elements in {-n,...n} and determinant 5.

4

0, 0, 8, 64, 128, 408, 472, 664, 792, 984, 1272, 1592, 1720, 2104, 2296, 2872, 3128, 3640, 3832, 4408, 4984, 5368, 5688, 6392, 6648, 7928, 8312, 8888, 9272, 10168, 10744, 11704, 12216, 12856, 13368, 15096, 15480, 16632, 17208, 17976

(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

MATHEMATICA

(See the Mathematica section at A209981.)

CROSSREFS

Sequence in context: A134739 A116978 A125110 * A235425 A255932 A043152

Adjacent sequences: A209987 A209988 A209989 * A209991 A209992 A209993

KEYWORD

nonn

AUTHOR

Clark Kimberling, Mar 17 2012

STATUS

approved