Number of nondecreasing integer sequences of length 14 with sum zero and sum of absolute values 2n.

Terms

a(0) =1a(1) =4a(2) =9a(3) =25a(4) =49a(5) =121a(6) =225a(7) =481a(8) =882a(9) =1690a(10) =2899a(11) =5275a(12) =8622a(13) =14633a(14) =23387a(15) =37834a(16) =58113a(17) =90924a(18) =135610a(19) =204938a(20) =299216a(21) =438428a(22) =625118a(23) =897211a(24) =1253138a(25) =1756603a(26) =2414933a(27) =3322105a(28) =4489393a(29) =6080038