a(0)=0, a(1)=1, a(n)=20a(n-1)-20a(n-2).

A084329

a(0)=0, a(1)=1, a(n)=20a(n-1)-20a(n-2).

Terms

    a(0) =0a(1) =1a(2) =20a(3) =380a(4) =7200a(5) =136400a(6) =2584000a(7) =48952000a(8) =927360000a(9) =17568160000a(10) =332816000000

External references