23582713

Appears in sequences

• a(n) = 7*a(n-1) - 3*a(n-2), with a(0)=0, a(1)=1.at n=10A190972
• a(n) = a(n-1) + 3*a(n-2) if n is even, otherwise a(n) = 3*a(n-1) + a(n-2), a(0)=0, a(1)=1.at n=20A276288