G.f.: Sum_{n>=0} x^n/(1-x)^(6*n) * Sum_{k=0..n} C(n,k)^2 * x^k.
A249794
G.f.: Sum_{n>=0} x^n/(1-x)^(6*n) * Sum_{k=0..n} C(n,k)^2 * x^k.
Terms
- a(0) =1a(1) =1a(2) =8a(3) =44a(4) =232a(5) =1253a(6) =6895a(7) =38376a(8) =215396a(9) =1217109a(10) =6914696a(11) =39458777a(12) =226006814a(13) =1298557455a(14) =7481167001a(15) =43200760775a(16) =249977853797
External references
- oeis: A249794