Sierpinski cuboctahedral numbers: a(n) = 16*4^n - 12*2^n + 9.

A289999

Sierpinski cuboctahedral numbers: a(n) = 16*4^n - 12*2^n + 9.

Terms

    a(0) =13a(1) =49a(2) =217a(3) =937a(4) =3913a(5) =16009a(6) =64777a(7) =260617a(8) =1045513a(9) =4188169a(10) =16764937a(11) =67084297a(12) =268386313a(13) =1073643529a(14) =4294770697a(15) =17179475977a(16) =68718690313a(17) =274876334089

External references