a(n) = coefficient of sqrt(2) in the expansion of (1 + sqrt(2) + sqrt(3))^n.
A188571
a(n) = coefficient of sqrt(2) in the expansion of (1 + sqrt(2) + sqrt(3))^n.
Terms
- a(0) =0a(1) =1a(2) =2a(3) =14a(4) =48a(5) =224a(6) =880a(7) =3760a(8) =15360a(9) =64192a(10) =265088a(11) =1101440a(12) =4561920a(13) =18925568a(14) =78447616a(15) =325313536a(16) =1348730880a(17) =5592420352a(18) =23187169280a(19) =96141172736a(20) =398624489472
External references
- oeis: A188571