a(2*n) equals coefficient of x^n in A(x)^(n+1) and a(2*n+1) equals coefficient of x^n in A(x)^(n+2), for n>=0.
A094557
a(2*n) equals coefficient of x^n in A(x)^(n+1) and a(2*n+1) equals coefficient of x^n in A(x)^(n+2), for n>=0.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =9a(5) =14a(6) =40a(7) =65a(8) =210a(9) =339a(10) =1080a(11) =1764a(12) =5775a(13) =9448a(14) =30992a(15) =50931a(16) =168849a(17) =277920a(18) =925240a(19) =1525887a(20) =5106288a(21) =8431260a(22) =28309440a(23) =46796334a(24) =157627548a(25) =260788843a(26) =880639004a(27) =1458096900a(28) =4934715105a(29) =8175734400
External references
- oeis: A094557