a(n) = coefficient of sqrt(3) in the expansion of (1 + sqrt(2) + sqrt(3))^n sequence.

A188572

a(n) = coefficient of sqrt(3) in the expansion of (1 + sqrt(2) + sqrt(3))^n sequence.

Terms

    a(0) =0a(1) =1a(2) =2a(3) =12a(4) =40a(5) =184a(6) =720a(7) =3072a(8) =12544a(9) =52416a(10) =216448a(11) =899328a(12) =3724800a(13) =15452672a(14) =64052224a(15) =265617408a(16) =1101234176a(17) =4566192128a(18) =18932244480a(19) =78498938880a(20) =325475532800

External references