Number of (n+2)X3 0..2 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.

A185469

Number of (n+2)X3 0..2 arrays with each 3X3 subblock having rows and columns in lexicographically nondecreasing order.

Terms

    a(0) =1169a(1) =4594a(2) =13659a(3) =34779a(4) =79743a(5) =169052a(6) =336690a(7) =636698a(8) =1151966a(9) =2005704a(10) =3376100a(11) =5514721a(12) =8769262a(13) =13611298a(14) =20669745a(15) =30770788a(16) =44985087a(17) =64683126a(18) =91599625a(19) =127907991a(20) =176305841a(21) =240112688a(22) =323380940a(23) =431021422a(24) =568944692

External references