Triangle t(n,m) read by rows: t(n,m) = binomial(2^n-1, 2^m-1) if n >= 2*m, otherwise symmetrically extended t(n,m) = t(n,n-m).
A176791
Triangle t(n,m) read by rows: t(n,m) = binomial(2^n-1, 2^m-1) if n >= 2*m, otherwise symmetrically extended t(n,m) = t(n,n-m).
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =3a(5) =1a(6) =1a(7) =7a(8) =7a(9) =1a(10) =1a(11) =15a(12) =455a(13) =15a(14) =1a(15) =1a(16) =31a(17) =4495a(18) =4495a(19) =31a(20) =1a(21) =1a(22) =63a(23) =39711a(24) =553270671a(25) =39711a(26) =63a(27) =1a(28) =1a(29) =127
External references
- oeis: A176791