A011187 Number of ways to choose 2^n vectors in {0, 1, 2, 3}^n such that any two differ by at least 2 in at least one coordinate (2^n being maximal).

3, 79, 457645

Offset

1,1

Links

Table of n, a(n) for n=1..3.

Crossrefs

Sequence in context: A065399 A265592 A105065 * A327250 A197248 A183265

Adjacent sequences: A011184 A011185 A011186 * A011188 A011189 A011190

Keyword

nonn,bref,hard

Author

Jan Kristian Haugland

Status

approved