a(n) = n!-6*Catalan(n)+5*2^n+4*binomial(n,2)-2*Fibonacci(n)-14*n+20.
A341303
a(n) = n!-6*Catalan(n)+5*2^n+4*binomial(n,2)-2*Fibonacci(n)-14*n+20.
Terms
- a(0) =2a(1) =2a(2) =8a(3) =228a(4) =3086a(5) =32998a(6) =336238a(7) =3533094a(8) =39574232a(9) =477773836a(10) =6222604044a(11) =87162325914
External references
- oeis: A341303