Number of compositions of n such that the first part is 1 and the second differences of the parts are in {-3,...,3}.
A239553
Number of compositions of n such that the first part is 1 and the second differences of the parts are in {-3,...,3}.
Terms
- a(0) =1a(1) =1a(2) =1a(3) =2a(4) =4a(5) =7a(6) =13a(7) =23a(8) =40a(9) =73a(10) =132a(11) =235a(12) =425a(13) =767a(14) =1379a(15) =2491a(16) =4495a(17) =8105a(18) =14629a(19) =26407a(20) =47647a(21) =86009a(22) =155251a(23) =280202a(24) =505771a(25) =912930a(26) =1647796a(27) =2974292a(28) =5368610a(29) =9690288
External references
- oeis: A239553