List of pairs: {n*(n + 1)*(2*n + 1)/6, (n!)^2}.

Terms

a(0) =0a(1) =1a(2) =1a(3) =1a(4) =5a(5) =4a(6) =14a(7) =36a(8) =30a(9) =576a(10) =55a(11) =14400a(12) =91a(13) =518400a(14) =140a(15) =25401600a(16) =204a(17) =1625702400a(18) =285a(19) =131681894400a(20) =385a(22) =506a(24) =650a(26) =819a(28) =1015