Number of 3X3 nonnegative integer matrices with row and column i=1..3 having sum <= i*n.

A214012

Number of 3X3 nonnegative integer matrices with row and column i=1..3 having sum <= i*n.

Terms

    a(0) =271a(1) =7722a(2) =85639a(3) =564041a(4) =2663506a(5) =9976732a(6) =31499434a(7) =87205393a(8) =217519577a(9) =498458246a(10) =1064675833a(11) =2143185161a(12) =4101100212a(13) =7511389208a(14) =13241320196a(15) =22569031649a(16) =37334466803a(17) =60131772546a(18) =94551181659a(19) =145479371081

External references