a(n) = n*A002088(n).

Terms

a(0) =1a(1) =4a(2) =12a(3) =24a(4) =50a(5) =72a(6) =126a(7) =176a(8) =252a(9) =320a(10) =462a(11) =552a(12) =754a(13) =896a(14) =1080a(15) =1280a(16) =1632a(17) =1836a(18) =2280a(19) =2560a(20) =2940a(21) =3300a(22) =3956a(23) =4320a(24) =5000a(25) =5512a(26) =6210a(27) =6776a(28) =7830a(29) =8340