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A197487 Number of nonsingular n X n matrices with elements from {0,1,2}. 1
2, 50, 12792, 30844560 (list; graph; refs; listen; history; text; internal format)
OFFSET

1,1

LINKS

Table of n, a(n) for n=1..4.

MATHEMATICA

(* 2x2 case *) cnt = 0; Do[d = Det[{{a, b}, {c, d}}]; If[d != 0, cnt++], {a, 0, 2}, {b, 0, 2}, {c, 0, 2}, {d, 0, 2}]; cnt (* T. D. Noe, Nov 29 2011 *)

CROSSREFS

Cf. A055165, A056989.

Sequence in context: A210919 A210924 A203766 * A080293 A084107 A203746

Adjacent sequences:  A197484 A197485 A197486 * A197488 A197489 A197490

KEYWORD

nonn,more

AUTHOR

Roger Hui, Nov 29 2011

STATUS

approved

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Last modified August 13 19:30 EDT 2020. Contains 336451 sequences. (Running on oeis4.)