Number of arrays of n+2 integers in -2..2 with sum zero and the sum of every adjacent pair being odd.

A202070

Number of arrays of n+2 integers in -2..2 with sum zero and the sum of every adjacent pair being odd.

Terms

    a(0) =4a(1) =20a(2) =26a(3) =0a(4) =96a(5) =524a(6) =726a(7) =0a(8) =2760a(9) =15560a(10) =22084a(11) =0a(12) =85120a(13) =487564a(14) =700966a(15) =0a(16) =2723256a(17) =15746520a(18) =22820940a(19) =0a(20) =89115840a(21) =518517560a(22) =755594620a(23) =0a(24) =2961237136a(25) =17306539536a(26) =25319793096a(27) =0a(28) =99494853120a(29) =583417062540

External references