Column 3 of array in A133713.

Terms

a(0) =1a(1) =13a(2) =81a(3) =325a(4) =995a(5) =2541a(6) =5698a(7) =11586a(8) =21825a(9) =38665a(10) =65131a(11) =105183a(12) =163891a(13) =247625a(14) =364260a(15) =523396a(16) =736593a(17) =1017621a(18) =1382725a(19) =1850905a(20) =2444211a(21) =3188053a(22) =4111526a(23) =5247750a(24) =6634225a(25) =8313201a(26) =10332063a(27) =12743731a(28) =15607075