Number of n X 3 0..1 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.

A224033

Number of n X 3 0..1 arrays with antidiagonals unimodal and rows and diagonals nondecreasing.

Terms

    a(0) =4a(1) =13a(2) =37a(3) =105a(4) =298a(5) =848a(6) =2419a(7) =6908a(8) =19737a(9) =56401a(10) =161181a(11) =460622a(12) =1316360a(13) =3761867a(14) =10750568a(15) =30722673a(16) =87798365a(17) =250907593a(18) =717036338a(19) =2049125344a(20) =5855930115a(21) =16734904820a(22) =47824518777a(23) =136671503209a(24) =390575802373

External references