a(n) = (2^n/n!) * Product_{k=0..n-1} (4*k + 7).
A004986
a(n) = (2^n/n!) * Product_{k=0..n-1} (4*k + 7).
Terms
- a(0) =1a(1) =14a(2) =154a(3) =1540a(4) =14630a(5) =134596a(6) =1211364a(7) =10729224a(8) =93880710a(9) =813632820a(10) =6997242252a(11) =59794615608a(12) =508254232668
External references
- oeis: A004986