Number of -n..n arrays of 7 elements with first through fourth differences also in -n..n.
A202667
Number of -n..n arrays of 7 elements with first through fourth differences also in -n..n.
Terms
- a(0) =23a(1) =613a(2) =6055a(3) =34171a(4) =136999a(5) =438177a(6) =1186107a(7) =2839237a(8) =6169921a(9) =12410957a(10) =23428771a(11) =41960815a(12) =71850731a(13) =118414399a(14) =188766767a(15) =292290383a(16) =441086445a(17) =650648037a(18) =940297237a(19) =1334163773a(20) =1861743181a(21) =2558935713a(22) =3468879881
External references
- oeis: A202667