a(n) = coefficient of the term that is independent of 2^(1/3) and 2^(2/3) in the expansion of (1 + 2^(1/3) + 2^(2/3))^n.
A377314
a(n) = coefficient of the term that is independent of 2^(1/3) and 2^(2/3) in the expansion of (1 + 2^(1/3) + 2^(2/3))^n.
Terms
- a(0) =1a(1) =1a(2) =5a(3) =19a(4) =73a(5) =281a(6) =1081a(7) =4159a(8) =16001a(9) =61561a(10) =236845a(11) =911219a(12) =3505753a(13) =13487761a(14) =51891761a(15) =199644319a(16) =768096001a(17) =2955112721a(18) =11369270485a(19) =43741245619a(20) =168286661033a(21) =647452990441
External references
- oeis: A377314