Column 5 of A048790.

Terms

a(0) =0a(1) =5a(2) =315a(3) =2670a(4) =10810a(5) =30475a(6) =69405a(7) =137340a(8) =246020a(9) =409185a(10) =642575a(11) =963930a(12) =1392990a(13) =1951495a(14) =2663185a(15) =3553800a(16) =4651080a(17) =5984765a(18) =7586595a(19) =9490310a(20) =11731650a(21) =14348355a(22) =17380165a(23) =20868820a(24) =24858060a(25) =29393625a(26) =34523255a(27) =40296690a(28) =46765670a(29) =53983935