43046718

Appears in sequences

• Number of primitive (aperiodic) palindromes using a maximum of three different symbols.at n=30A056459
• Number of primitive (period n) periodic palindromes using a maximum of three different symbols.at n=30A056494
• The sequence lambda(3,n), where lambda is defined in A055203. Number of ways of placing n identifiable positive intervals with a total of exactly three starting and/or finishing points.at n=16A058809
• Triangle read by rows in which the n-th row contains n distinct numbers whose sum is n^n. The numbers are terms of an arithmetic progression with a common difference 1 or 2 respectively accordingly as n is odd or even.at n=37A080524
• Main diagonal of triangle A321600; a(n) = A321600(n,n-1) for n >= 1.at n=15A322116