50848

Appears in sequences

• 30 'Reverse and Add' steps are needed to reach a palindrome.at n=32A065319
• Number of base 20 n-digit numbers with adjacent digits differing by two or less.at n=6A126407
• a(0)=0, a(1)=1, a(n) = min{3 a(k) + (3^(n-k)-1)/2, k=0..(n-1)} for n>=2.at n=40A259653
• Number of vertices in a "frame" of size n X n (see Comments in A331776 for definition).at n=16A332598