A363090 Number of 3-dimensional directed animals of size n.

1, 3, 12, 52, 237, 1113, 5339, 26011, 128247, 638346, 3201967, 16164384, 82044151

Offset

1,2

Comments

Fixed 3-dimensional fixed polycubes with neighborhood vectors [1, 0, 0], [0, 1, 0], and [0, 0, 1].

A005773 is the 2-dimensional equivalent: fixed polyominoes with neighborhood vectors [1, 0] and [0, 1].

Using neighborhood vectors [+-1, 0, 0], [0, +-1, 0], and [0, 0, +-1] gives A001931.

Links

Table of n, a(n) for n=1..13.

Crossrefs

Cf. A005773.

Sequence in context: A007856 A151195 A151196 * A010736 A151197 A007198

Adjacent sequences: A363087 A363088 A363089 * A363091 A363092 A363093

Keyword

nonn,hard,more

Author

Joerg Arndt and Márk Péter Légrádi, May 19 2023

Status

approved