a(n+2) = 7*a(n+1) - 7*a(n) - 9*n; a(n+4) = 9*a(n+3) - 22*a(n+2) + 21*a(n+1) - 7*a(n).
A030429
a(n+2) = 7*a(n+1) - 7*a(n) - 9*n; a(n+4) = 9*a(n+3) - 22*a(n+2) + 21*a(n+1) - 7*a(n).
Terms
- a(0) =1a(1) =2a(2) =7a(3) =26a(4) =115a(5) =596a(6) =3331a(7) =19100a(8) =110329a(9) =638540a(10) =3697405a(11) =21411974a(12) =124001893a(13) =718129334a(14) =4158891979a(15) =24085338398a(16) =139485124807a(17) =807798504728
External references
- oeis: A030429