a(0) = 0, a(1) = 1, a(2) = 1, a(3) = 2, a(4) = 4, for n>3: a(n+1) = SORT[a(n) + a(n-1) + a(n-2) + a(n-3)], where SORT places digits in ascending order and deletes 0's.

A108564

a(0) = 0, a(1) = 1, a(2) = 1, a(3) = 2, a(4) = 4, for n>3: a(n+1) = SORT[a(n) + a(n-1) + a(n-2) + a(n-3)], where SORT places digits in ascending order and deletes 0's.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =2a(4) =4a(5) =8a(6) =15a(7) =29a(8) =56a(9) =18a(10) =118a(11) =122a(12) =134a(13) =239a(14) =136a(15) =136a(16) =456a(17) =679a(18) =147a(19) =1148a(20) =234a(21) =228a(22) =1577a(23) =1378a(24) =1347a(25) =345a(26) =4467a(27) =3577a(28) =3679a(29) =1268

External references