Elements in 4-Pascal triangle (by row).

Terms

a(0) =1a(1) =1a(2) =1a(3) =1a(4) =4a(5) =1a(6) =1a(7) =5a(8) =5a(9) =1a(10) =1a(11) =6a(12) =10a(13) =6a(14) =1a(15) =1a(16) =7a(17) =16a(18) =16a(19) =7a(20) =1a(21) =1a(22) =8a(23) =23a(24) =32a(25) =23a(26) =8a(27) =1a(28) =1a(29) =9