a(n) = -7^n*A(2*n+1), where A(n) = A(n-1) + A(n-2) + A(n-3)/7, with A(0)=3, A(1)=1, A(2)=3.
A215794
a(n) = -7^n*A(2*n+1), where A(n) = A(n-1) + A(n-2) + A(n-3)/7, with A(0)=3, A(1)=1, A(2)=3.
Terms
- a(0) =-1a(1) =-31a(2) =-609a(3) =-11711a(4) =-224833a(5) =-4315871a(6) =-82846113a(7) =-1590286719a(8) =-30526618241a(9) =-585978870687
External references
- oeis: A215794