a(n) = Sum_{i=1..n} binomial(i+5,6)^2.

Terms

a(0) =1a(1) =50a(2) =834a(3) =7890a(4) =51990a(5) =265434a(6) =1119210a(7) =4063866a(8) =13081875a(9) =38131900a(10) =102259964a(11) =255425340a(12) =600047436a(13) =1336192860a(14) =2838530460a(15) =5783112156a(16) =11350211925a(17) =21540508734a(18) =39656591950a(19) =71021001950a(20) =124026854850a(21) =211648774950a(22) =353581802550a(23) =579225802950a(24) =931794553575