40245

Appears in sequences

• Number of base 21 n-digit numbers with adjacent digits differing by one or less.at n=8A126375
• Number of n X 8 binary arrays without the pattern 0 1 diagonally, vertically or antidiagonally.at n=19A188865
• Records in A171898.at n=26A309813
• a(1) = a(2) = 1; a(n) = gcd(a(n-1), a(n-2)) + (a(n-1) + a(n-2))/gcd(a(n-1), a(n-2)).at n=27A355898