Half of the height of the right trapezoidal gnomon (of the derivative of Y=X^5).

Terms

a(0) =1a(1) =30a(2) =181a(3) =600a(4) =1501a(5) =3150a(6) =5881a(7) =10080a(8) =16201a(9) =24750a(10) =36301a(11) =51480a(12) =70981a(13) =95550a(14) =126001a(15) =163200a(16) =208081a(17) =261630a(18) =324901a(19) =399000a(20) =485101a(21) =584430a(22) =698281a(23) =828000a(24) =975001a(25) =1140750a(26) =1326781a(27) =1534680a(28) =1766101a(29) =2022750