277376074

Appears in sequences

• a(n) = 3*a(n-1) + a(n-2) - a(n-3) for n >= 3, a(0)=1, a(1)=2, a(2)=7.at n=17A030186
• a(2*n) = A030186(n), a(2*n+1) = A033505(n).at n=34A365967