A363090 - OEIS

A363090

Number of 3-dimensional directed animals of size n.

1, 3, 12, 52, 237, 1113, 5339, 26011, 128247, 638346, 3201967, 16164384, 82044151, 418352107, 2141761669, 11003117220

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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

CROSSREFS

KEYWORD

nonn,hard,more

AUTHOR

EXTENSIONS

a(14)-a(16) from Johann Peters, Nov 21 2024

STATUS

approved