Number of nondecreasing -n..n vectors of length 4 whose dot product with some nonincreasing -n..n vector equals 4.

A226401

Number of nondecreasing -n..n vectors of length 4 whose dot product with some nonincreasing -n..n vector equals 4.

Terms

    a(0) =2a(1) =48a(2) =146a(3) =448a(4) =912a(5) =1646a(6) =2812a(7) =4564a(8) =6826a(9) =9996a(10) =14208a(11) =19364a(12) =26146a(13) =34488a(14) =44090a(15) =56418a(16) =71092a(17) =87614a(18) =107854a(19) =131136a(20) =156880a(21) =187906a(22) =223218a(23) =261362a(24) =305902a(25) =356414a(26) =410362a(27) =472988a(28) =542558a(29) =615414

External references