Column 3 of A061314.

Terms

a(0) =0a(1) =4a(2) =40a(3) =304a(4) =1720a(5) =7480a(6) =26404a(7) =79240a(8) =209304a(9) =499140a(10) =1095160a(11) =2242504a(12) =4332640a(13) =7966504a(14) =14036260a(15) =23829040a(16) =39156304a(17) =62512740a(18) =97268904a(19) =147902080a(20) =220270120a(21) =321933304a(22) =462529540a(23) =654208504a(24) =912130600a(25) =1255036900a(26) =1705896504a(27) =2292638040a(28) =3048972304a(29) =4015313320