a(1) = 1 and a(n) = Sum_{k = 0..n-2} (-1)^k * binomial(n,k)^2 * binomial(n-2,k) for n >= 2.
A361711
a(1) = 1 and a(n) = Sum_{k = 0..n-2} (-1)^k * binomial(n,k)^2 * binomial(n-2,k) for n >= 2.
Terms
- a(0) =1a(1) =1a(2) =-8a(3) =5a(4) =126a(5) =-168a(6) =-2400a(7) =4125a(8) =50050a(9) =-98098a(10) =-1100736a(11) =2339064a(12) =25069968a(13) =-56279520a(14) =-585307008a(15) =1367240589a(16) =13919870250a(17) =-33510798750a(18) =-335813478000a(19) =827780223270
External references
- oeis: A361711