A365566 Triangle read by rows: T(n,d) is the number of inequivalent properly d-dimensional n-polysticks (or polyedges), 1 <= d <= n.

1, 1, 1, 1, 4, 2, 1, 15, 12, 3, 1, 54, 105, 39, 6, 1, 221, 863, 566, 117, 11

Offset

1,5

Links

Table of n, a(n) for n=1..21.

Index entries for sequences related to polyominoes.

Formula

T(n,n) = A000055(n+1).

Example

Triangle begins:
  n\d | 1   2   3   4   5  6
  ----+---------------------
   1  | 1
   2  | 1   1
   3  | 1   4   2
   4  | 1  15  12   3
   5  | 1  54 105  39   6
   6  | 1 221 863 566 117 11

Crossrefs

Cf. A000055, A049430, A365565 (row sums).

Sequence in context: A171650 A225476 A143777 * A326659 A236830 A269736

Adjacent sequences: A365563 A365564 A365565 * A365567 A365568 A365569

Keyword

nonn,tabl,hard,more

Author

Pontus von Brömssen, Sep 09 2023

Status

approved