a(n) = (Sum_{j=1..h-1} a(n-j) + a(n-1)*a(n-h+1))/a(n-h) with a(1), ..., a(h)=1, where h = 4.
A283958
a(n) = (Sum_{j=1..h-1} a(n-j) + a(n-1)*a(n-h+1))/a(n-h) with a(1), ..., a(h)=1, where h = 4.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =10a(6) =25a(7) =139a(8) =391a(9) =1033a(10) =5806a(11) =16384a(12) =43345a(13) =243685a(14) =687709a(15) =1819441a(16) =10228936a(17) =28867366a(18) =76373161a(19) =429371599a(20) =1211741635a(21) =3205853305a(22) =18023378194a(23) =50864281276a(24) =134569465633a(25) =756552512521
External references
- oeis: A283958