a(n) = coefficient of the term that is independent of sqrt(2) and sqrt(3) in the expansion of (1 + sqrt(2) + sqrt(3))^n.
A188570
a(n) = coefficient of the term that is independent of sqrt(2) and sqrt(3) in the expansion of (1 + sqrt(2) + sqrt(3))^n.
Terms
- a(0) =1a(1) =1a(2) =6a(3) =16a(4) =80a(5) =296a(6) =1296a(7) =5216a(8) =21952a(9) =90304a(10) =375936a(11) =1555456a(12) =6456320a(13) =26754560a(14) =110963712a(15) =460015616a(16) =1907494912a(17) =7908659200a(18) =32792076288a(19) =135963148288a(20) =563742310400
External references
- oeis: A188570