261624

Appears in sequences

• Number of primitive (aperiodic) palindromic structures using exactly three different symbols.at n=24A056482
• Number of primitive (period n) periodic palindromic structures using exactly three different symbols.at n=24A056519
• Number of triangular regions in a "frame" of size n X n (see Comments in A331776 for definition), divided by 4.at n=41A332595