a(n) = 7*a(n-1) - 14*a(n-2) + 7*a(n-3), a(0) = 1, a(1) = 3, a(2) = 11.
A319512
a(n) = 7*a(n-1) - 14*a(n-2) + 7*a(n-3), a(0) = 1, a(1) = 3, a(2) = 11.
Terms
- a(0) =1a(1) =3a(2) =11a(3) =42a(4) =161a(5) =616a(6) =2352a(7) =8967a(8) =34153a(9) =129997a(10) =494606a(11) =1881355a(12) =7154980a(13) =27208132a(14) =103456689a(15) =393367835a(16) =1495638123a(17) =5686513994a(18) =21620239081a(19) =82199944512a(20) =312521862408
External references
- oeis: A319512