OFFSET
1,3
COMMENTS
FORMULA
EXAMPLE
As an irregular triangle:
0;
1;
2, 1;
2, 3, 2, 2, 2, 3, 1;
3, 2, 3, 3, 4, 4, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 2, 3, 2, 2, 2, 3, 3, 4, 1, 2;
...
For the 4th row, the seven 4-cell polyominoes, with codes 15, 23, 39, 43, 46, 51, 139 (4th row of A365142), are the L-tetromino, the properly 3-dimensional nonchiral tetracube, the square tetromino, the T-tetromino, the S-tetromino, the properly 3-dimensional chiral tetracube, and the straight tetromino, with proper dimensions 2, 3, 2, 2, 2, 3, 1, respectively.
CROSSREFS
KEYWORD
nonn,tabf
AUTHOR
Pontus von Brömssen, Aug 25 2023
STATUS
approved