Number of (n+1)X(1+1) 0..2 arrays with 2X2 subblock sum of squares lexicographically nondecreasing rowwise and nonincreasing columnwise.

A235417

Number of (n+1)X(1+1) 0..2 arrays with 2X2 subblock sum of squares lexicographically nondecreasing rowwise and nonincreasing columnwise.

Terms

    a(0) =81a(1) =432a(2) =2304a(3) =9504a(4) =39204a(5) =138402a(6) =488601a(7) =1553877a(8) =4941729a(9) =14587326a(10) =43059844a(11) =120242088a(12) =335768976a(13) =898407396a(14) =2403842841a(15) =6218691273a(16) =16087624569a(17) =40503112884a(18) =101972926224a(19) =251077339656a(20) =618201642564

External references