a(n) = T(2n,n-1), where T is the array defined in A026105.
A026115
a(n) = T(2n,n-1), where T is the array defined in A026105.
Terms
- a(0) =1a(1) =3a(2) =15a(3) =77a(4) =413a(5) =2266a(6) =12636a(7) =71290a(8) =405790a(9) =2325923a(10) =13406666a(11) =77632590a(12) =451270925a(13) =2631763500a(14) =15391191315a(15) =90230338449a(16) =530098757210
External references
- oeis: A026115