Number of 4 X n 0..2 arrays with diagonals and antidiagonals unimodal and rows nondecreasing.

A224355

Number of 4 X n 0..2 arrays with diagonals and antidiagonals unimodal and rows nondecreasing.

Terms

    a(0) =81a(1) =1296a(2) =5880a(3) =19608a(4) =57387a(5) =151010a(6) =363392a(7) =810436a(8) =1693423a(9) =3344982a(10) =6292120a(11) =11340202a(12) =19682181a(13) =33037788a(14) =53827802a(15) =85388930a(16) =132235237a(17) =200372476a(18) =297672078a(19) =434311972a(20) =623291815a(21) =881030622a(22) =1228055196a(23) =1689788168

External references