Number of n X 6 0..1 arrays with rows and columns lexicographically nondecreasing read forwards, and nonincreasing read backwards.

A201373

Number of n X 6 0..1 arrays with rows and columns lexicographically nondecreasing read forwards, and nonincreasing read backwards.

Terms

    a(0) =2a(1) =7a(2) =32a(3) =157a(4) =786a(5) =3739a(6) =15574a(7) =55410a(8) =170616a(9) =465037a(10) =1145954a(11) =2597729a(12) =5492076a(13) =10947133a(14) =20749996a(15) =37660122a(16) =65814022a(17) =111254955a(18) =182614908a(19) =291980013a(20) =455974718a(21) =697104503a(22) =1045401722a(23) =1540424266a(24) =2233662188a(25) =3191413217

External references