Third column (negated) of triangle in A182971.

Terms

a(0) =0a(1) =0a(2) =0a(3) =0a(4) =225a(5) =2304a(6) =12916a(7) =52480a(8) =172810a(9) =489280a(10) =1234948a(11) =2846272a(12) =6092515a(13) =12263680a(14) =23434840a(15) =42828032a(16) =75296468a(17) =127959680a(18) =211022360a(19) =338814080a(20) =531091781a(21) =814651904a(22) =1225304300a(23) =1810265600a(24) =2631035550a(25) =3766825920a(26) =5318617980a(27) =7413931200a(28) =10212392775a(29) =13912204800