Triangle T(n, k) = c(n, q)/c(k, q) if k <= floor(n/2), otherwise c(n, q)/c(n-k, q), where c(n, q) = Product_{j=1..n} (1 - q^j) and q = 3, read by rows.
A174388
Triangle T(n, k) = c(n, q)/c(k, q) if k <= floor(n/2), otherwise c(n, q)/c(n-k, q), where c(n, q) = Product_{j=1..n} (1 - q^j) and q = 3, read by rows.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =-8a(5) =1a(6) =1a(7) =-26a(8) =-26a(9) =1a(10) =1a(11) =-80a(12) =2080a(13) =-80a(14) =1a(15) =1a(16) =-242a(17) =19360a(18) =19360a(19) =-242a(20) =1a(21) =1a(22) =-728a(23) =176176a(24) =-14094080a(25) =176176a(26) =-728a(27) =1a(28) =1a(29) =-2186
External references
- oeis: A174388