Central terms of triangle A278885: a(n) = A278885(n,n+1) = -A278885(n,n) for n>=1.
A278888
Central terms of triangle A278885: a(n) = A278885(n,n+1) = -A278885(n,n) for n>=1.
Terms
- a(0) =1a(1) =0a(2) =-2a(3) =6a(4) =104a(5) =130a(6) =-7480a(7) =17808a(8) =790524a(9) =-113170a(10) =-206401200a(11) =259762932a(12) =53140218296a(13) =-111175815660
External references
- oeis: A278888