Central terms of triangles A278886 and A278887: a(n) = A278886(n,n) = A278887(n,n+1) for n>=0.
A278889
Central terms of triangles A278886 and A278887: a(n) = A278886(n,n) = A278887(n,n+1) for n>=0.
Terms
- a(0) =1a(1) =0a(2) =0a(3) =2a(4) =15a(5) =-20a(6) =-634a(7) =2436a(8) =42411a(9) =-233510a(10) =-11619696a(11) =49163400a(12) =2036481646a(13) =-16025646000a(14) =-918152531964
External references
- oeis: A278889