Number of nondecreasing integer sequences of length 5 with sum zero and sum of absolute values 2n.

Terms

a(0) =1a(1) =4a(2) =8a(3) =17a(4) =23a(5) =44a(6) =54a(7) =85a(8) =107a(9) =150a(10) =178a(11) =247a(12) =281a(13) =366a(14) =422a(15) =527a(16) =591a(17) =734a(18) =808a(19) =975a(20) =1079a(21) =1272a(22) =1388a(23) =1633a(24) =1761a(25) =2036a(26) =2204a(27) =2513a(28) =2695a(29) =3068