Number of nondecreasing -3..3 vectors of length n whose dot product with some nonincreasing -3..3 vector equals n.

A226394

Number of nondecreasing -3..3 vectors of length n whose dot product with some nonincreasing -3..3 vector equals n.

Terms

    a(0) =2a(1) =20a(2) =68a(3) =146a(4) =258a(5) =756a(6) =1012a(7) =1866a(8) =3762a(9) =5020a(10) =6854a(11) =13706a(12) =15514a(13) =22540a(14) =38982a(15) =43620a(16) =54834a(17) =96164a(18) =98406a(19) =128232a(20) =207814a(21) =213600a(22) =253828a(23) =414128a(24) =402352a(25) =495006a(26) =764912a(27) =744280a(28) =859550a(29) =1342098

External references