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A210001 Number of 2 X 2 matrices having all elements in {1,2,...,n} and determinant 3. 3
0, 0, 1, 7, 11, 23, 39, 59, 71, 115, 127, 163, 199, 243, 263, 339, 367, 427, 471, 539, 567, 683, 719, 803, 879, 955, 999, 1139, 1183, 1291, 1367, 1483, 1543, 1739, 1799, 1891, 1983, 2123, 2191, 2427, 2487, 2643, 2759, 2923, 2999, 3187, 3271 (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, A209978.

Sequence in context: A082496 A239733 A265768 * A294074 A228227 A107133

Adjacent sequences:  A209998 A209999 A210000 * A210002 A210003 A210004

KEYWORD

nonn

AUTHOR

Clark Kimberling, Mar 16 2012

STATUS

approved

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Last modified January 17 18:14 EST 2020. Contains 330987 sequences. (Running on oeis4.)