T(n,k)=Number of nXk 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.

A201700

T(n,k)=Number of nXk 0..2 arrays with rows and columns lexicographically nondecreasing read forwards and nonincreasing read backwards.

Terms

    a(0) =3a(1) =3a(2) =3a(3) =3a(4) =10a(5) =3a(6) =3a(7) =18a(8) =18a(9) =3a(10) =3a(11) =27a(12) =116a(13) =27a(14) =3a(15) =3a(16) =37a(17) =395a(18) =395a(19) =37a(20) =3a(21) =3a(22) =48a(23) =989a(24) =4998a(25) =989a(26) =48a(27) =3a(28) =3a(29) =60

External references