Antidiagonal sums of triangle A118190: a(n) = Sum_{k=0..floor(n/2)} 5^(k*(n-2*k)) for n>=0.
A118192
Antidiagonal sums of triangle A118190: a(n) = Sum_{k=0..floor(n/2)} 5^(k*(n-2*k)) for n>=0.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =6a(4) =27a(5) =151a(6) =1252a(7) =18876a(8) =421877a(9) =11797501a(10) =489062502a(11) =36867190626
External references
- oeis: A118192