a(n) = 6 + 4*(-1)^n + (2+sqrt(3))^n + (2-sqrt(3))^n + 2*(1+sqrt(2))^n + 2*(1-sqrt(2))^n.

A232999

a(n) = 6 + 4*(-1)^n + (2+sqrt(3))^n + (2-sqrt(3))^n + 2*(1+sqrt(2))^n + 2*(1-sqrt(2))^n.

Terms

    a(0) =16a(1) =10a(2) =36a(3) =82a(4) =272a(5) =890a(6) =3108a(7) =11042a(8) =39952a(9) =146026a(10) =537636a(11) =1988722a(12) =7379216a(13) =27436250a(14) =102144036a(15) =380604482a(16) =1418981392a(17) =5292200650a(18) =19742287908a(19) =73658763922a(20) =274848860432

External references