a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026300.
A026940
a(n) = Sum_{k=0..n-1} T(n,k) * T(n,k+1), with T given by A026300.
Terms
- a(0) =1a(1) =6a(2) =38a(3) =256a(4) =1805a(5) =13162a(6) =98469a(7) =751656a(8) =5831451a(9) =45847770a(10) =364498596a(11) =2925337352a(12) =23668977163a(13) =192859753310
External references
- oeis: A026940