login
This site is supported by donations to The OEIS Foundation.

 

Logo


Hints
(Greetings from The On-Line Encyclopedia of Integer Sequences!)
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

Cf. A210000.

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

Lookup | Welcome | Wiki | Register | Music | Plot 2 | Demos | Index | Browse | More | WebCam
Contribute new seq. or comment | Format | Style Sheet | Transforms | Superseeker | Recent
The OEIS Community | Maintained by The OEIS Foundation Inc.

License Agreements, Terms of Use, Privacy Policy. .

Last modified January 21 02:59 EST 2019. Contains 319344 sequences. (Running on oeis4.)