Numerator of 120*Stirling_2(n,5)/n!.

Terms

a(0) =1a(1) =5a(2) =10a(3) =25a(4) =331a(5) =45a(6) =2243a(7) =1045a(8) =7501a(9) =2669a(10) =19301a(11) =8923a(12) =332514803a(13) =113561159a(14) =6527611a(15) =220907a(16) =31992967a(17) =8808901a(18) =3810944197a(19) =2555998859a(21) =389558724647a(23) =2896489667