Number of integer sequences of length n+1 with sum zero and sum of absolute values 6.

Terms

a(0) =2a(1) =18a(2) =92a(3) =340a(4) =1010a(5) =2562a(6) =5768a(7) =11832a(8) =22530a(9) =40370a(10) =68772a(11) =112268a(12) =176722a(13) =269570a(14) =400080a(15) =579632a(16) =822018a(17) =1143762a(18) =1564460a(19) =2107140a(20) =2798642a(21) =3670018a(22) =4756952a(23) =6100200a(24) =7746050a(25) =9746802a(26) =12161268a(27) =15055292a(28) =18502290a(29) =22583810