Minimal number of factorials that add to n.

Terms

a(0) =0a(1) =1a(2) =1a(3) =2a(4) =2a(5) =3a(6) =1a(7) =2a(8) =2a(9) =3a(10) =3a(11) =4a(12) =2a(13) =3a(14) =3a(15) =4a(16) =4a(17) =5a(18) =3a(19) =4a(20) =4a(21) =5a(22) =5a(23) =6a(24) =1a(25) =2a(26) =2a(27) =3a(28) =3a(29) =4