Number of length n+2 0..2 arrays with some pair in every consecutive three terms totalling exactly 2.

A245864

Number of length n+2 0..2 arrays with some pair in every consecutive three terms totalling exactly 2.

Terms

    a(0) =19a(1) =45a(2) =103a(3) =239a(4) =553a(5) =1281a(6) =2967a(7) =6873a(8) =15921a(9) =36881a(10) =85435a(11) =197911a(12) =458463a(13) =1062035a(14) =2460217a(15) =5699123a(16) =13202089a(17) =30582803a(18) =70845443a(19) =164114349a(20) =380172929a(21) =880675315a(22) =2040095313a(23) =4725906149a(24) =10947620333a(25) =25360298571a(26) =58747446847

External references