Number of 3X3 0..n matrices with row and column 1..3 having sum <= i*n.

A213963

Number of 3X3 0..n matrices with row and column 1..3 having sum <= i*n.

Terms

    a(0) =138a(1) =3186a(2) =32060a(3) =199735a(4) =909900a(5) =3323712a(6) =10301232a(7) =28115505a(8) =69342790a(9) =157454154a(10) =333771516a(11) =667605263a(12) =1270560760a(13) =2316187440a(14) =4066346688a(15) =6905893425a(16) =11387501154a(17) =18288711250a(18) =28683554460a(19) =44031375927a(20) =66285794564

External references