a(n) = sum of absolute valued coefficients of (1+x-4*x^2)^n.
A084775
a(n) = sum of absolute valued coefficients of (1+x-4*x^2)^n.
Terms
- a(0) =1a(1) =6a(2) =34a(3) =184a(4) =956a(5) =4776a(6) =22986a(7) =118304a(8) =624634a(9) =3281346a(10) =17687330a(11) =92606914a(12) =470392898a(13) =2348031430a(14) =11932314170a(15) =62345998488a(16) =326780375778
External references
- oeis: A084775