a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026615.
A026958
a(n) = Sum_{k=0..n-2} T(n,k) * T(n,k+2), with T given by A026615.
Terms
- a(0) =1a(1) =10a(2) =69a(3) =340a(4) =1476a(5) =6074a(6) =24419a(7) =97136a(8) =384428a(9) =1517422a(10) =5981070a(11) =23556746a(12) =92743296a(13) =365078146a(14) =1437124303a(15) =5657887016a(16) =22279053380a(17) =87749051950a(18) =345704345066
External references
- oeis: A026958