Fourth column (m=3) of triangle A060102.

Terms

a(0) =1a(1) =13a(2) =71a(3) =259a(4) =742a(5) =1806a(6) =3906a(7) =7722a(8) =14223a(9) =24739a(10) =41041a(11) =65429a(12) =100828a(13) =150892a(14) =220116a(15) =313956a(16) =438957a(17) =602889a(18) =814891a(19) =1085623a(20) =1427426a(21) =1854490a(22) =2383030a(23) =3031470a(24) =3820635a(25) =4773951a(26) =5917653a(27) =7281001a(28) =8896504a(29) =10800152