D(n,0)/2^n, where D(n,x) is triangle A098277.
A098278
D(n,0)/2^n, where D(n,x) is triangle A098277.
Terms
- a(0) =1a(1) =1a(2) =3a(3) =21a(4) =267a(5) =5349a(6) =154923a(7) =6120741a(8) =316271787a(9) =20701782309
External references
- oeis: A098278
A098278
D(n,0)/2^n, where D(n,x) is triangle A098277.