Numerator of 2*Sum(C(n,w)/(2*w+1),w=0..n/2-1)+C(n,n/2)/(n+1) if n is even, or of 2*Sum(C(n,w)/(2*w+1),w=0..(n-1)/2) if n is odd.
A085568
Numerator of 2*Sum(C(n,w)/(2*w+1),w=0..n/2-1)+C(n,n/2)/(n+1) if n is even, or of 2*Sum(C(n,w)/(2*w+1),w=0..(n-1)/2) if n is odd.
Terms
- a(0) =1a(1) =2a(2) =8a(3) =4a(4) =88a(5) =28a(6) =104a(7) =376a(8) =1904a(9) =372a(10) =30152a(11) =4952a(12) =193072a(13) =245848a(14) =64304a(15) =7984a(16) =8303392a(17) =32131172a(18) =126932136a(19) =164384184a(20) =185914544a(21) =16850280a(22) =3006076208a(23) =249890288a(24) =5554299808a(25) =21745428728a(26) =9598969456a(27) =37645191344a(29) =378608431568
External references
- oeis: A085568