a(n) = Sum_{k=0..n} (-5)^(n-k) * binomial(n-1,n-k) * binomial(2*k,k).
A360322
a(n) = Sum_{k=0..n} (-5)^(n-k) * binomial(n-1,n-k) * binomial(2*k,k).
Terms
- a(0) =1a(1) =2a(2) =-4a(3) =10a(4) =-30a(5) =102a(6) =-376a(7) =1462a(8) =-5900a(9) =24470a(10) =-103644a(11) =446382a(12) =-1948854a(13) =8605290a(14) =-38362200a(15) =172423770a(16) =-780496110a(17) =3554991270a(18) =-16281079900a(19) =74927379550a(20) =-346328465930
External references
- oeis: A360322