Partial sums of A050483.

Terms

a(0) =1a(1) =12a(2) =72a(3) =300a(4) =990a(5) =2772a(6) =6864a(7) =15444a(8) =32175a(9) =62920a(10) =116688a(11) =206856a(12) =352716a(13) =581400a(14) =930240a(15) =1449624a(16) =2206413a(17) =3287988a(18) =4807000a(19) =6906900a(20) =9768330a(21) =13616460a(22) =18729360a(23) =25447500a(24) =34184475a(25) =45439056a(26) =59808672a(27) =78004432a(28) =100867800a(29) =129389040