Number of 4Xn 0..3 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.

A223964

Number of 4Xn 0..3 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.

Terms

    a(0) =256a(1) =5864a(2) =41006a(3) =176893a(4) =594286a(5) =1718057a(6) =4500818a(7) =10981150a(8) =25334630a(9) =55772240a(10) =117841845a(11) =239976226a(12) =472531867a(13) =902107834a(14) =1673660678a(15) =3023882381a(16) =5330533450a(17) =9183978785a(18) =15489123731a(19) =25608363453a(20) =41559120445a(21) =66283141375

External references