a(n) = ceiling((16^n)*Sum_{k=0..n+1} (4/(8k+1)-2/(8k+4)-1/(8k+5)-1/(8k+6))/16^k).
A343572
a(n) = ceiling((16^n)*Sum_{k=0..n+1} (4/(8k+1)-2/(8k+4)-1/(8k+5)-1/(8k+6))/16^k).
Terms
- a(0) =4a(1) =51a(2) =805a(3) =12868a(4) =205888a(5) =3294199a(6) =52707179a(7) =843314857a(8) =13493037705a(9) =215888603273
External references
- oeis: A343572