Fourth convolution of Catalan numbers: a(n) = 4*binomial(2*n+3,n)/(n+4).

A002057

Fourth convolution of Catalan numbers: a(n) = 4*binomial(2*n+3,n)/(n+4).

Terms

    a(0) =1a(1) =4a(2) =14a(3) =48a(4) =165a(5) =572a(6) =2002a(7) =7072a(8) =25194a(9) =90440a(10) =326876a(11) =1188640a(12) =4345965a(13) =15967980a(14) =58929450a(15) =218349120a(16) =811985790a(17) =3029594040a(18) =11338026180a(19) =42550029600a(20) =160094486370a(21) =603784920024

External references