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

A245871

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

Terms

    a(0) =10a(1) =45a(2) =100a(3) =193a(4) =318a(5) =493a(6) =712a(7) =993a(8) =1330a(9) =1741a(10) =2220a(11) =2785a(12) =3430a(13) =4173a(14) =5008a(15) =5953a(16) =7002a(17) =8173a(18) =9460a(19) =10881a(20) =12430a(21) =14125a(22) =15960a(23) =17953a(24) =20098a(25) =22413a(26) =24892a(27) =27553a(28) =30390a(29) =33421

External references