A symmetrical sum triangle sequence:a(n)=vector(a(n-1)).Reverse(vector(a(n-1));a(0)=1;a(1)=2;t(n,m)=2+a(n)-a(m)-a(n-m).

A176698

A symmetrical sum triangle sequence:a(n)=vector(a(n-1)).Reverse(vector(a(n-1));a(0)=1;a(1)=2;t(n,m)=2+a(n)-a(m)-a(n-m).

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =2a(5) =1a(6) =1a(7) =8a(8) =8a(9) =1a(10) =1a(11) =28a(12) =34a(13) =28a(14) =1a(15) =1a(16) =104a(17) =130a(18) =130a(19) =104a(20) =1a(21) =1a(22) =400a(23) =502a(24) =522a(25) =502a(26) =400a(27) =1a(28) =1a(29) =1584

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