120357

Appears in sequences

• Number of axially symmetric polyominoes with n cells.at n=20A006746
• When this sequence is interleaved with its first differences and the resulting sequence is divided into blocks of 10 digits, each block contains 10 distinct digits. Each term is chosen to be the smallest that satisfies this property.at n=18A101246
• The Matula-Goebel numbers of the rooted trees that have palindromic Wiener polynomials.at n=40A198322
• Number of polyominoes with n cells and exactly one line of reflection symmetry, where that one line is parallel to the grid and passes through the center of at least one square.at n=20A349328