T(n,n-5), where T is the array in A055830.

Terms

a(0) =8a(1) =30a(2) =73a(3) =145a(4) =255a(5) =413a(6) =630a(7) =918a(8) =1290a(9) =1760a(10) =2343a(11) =3055a(12) =3913a(13) =4935a(14) =6140a(15) =7548a(16) =9180a(17) =11058a(18) =13205a(19) =15645a(20) =18403a(21) =21505a(22) =24978a(23) =28850a(24) =33150a(25) =37908a(26) =43155a(27) =48923a(28) =55245a(29) =62155