Number of (5+1) X (n+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
A253499
Number of (5+1) X (n+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
Terms
- a(0) =8501a(1) =9654a(2) =13528a(3) =19475a(4) =32652a(5) =61955a(6) =127898a(7) =281402a(8) =653210a(9) =1591226a(10) =4050458a(11) =10718522a(12) =29303450a(13) =82219706a(14) =235291418a(15) =683152442a(16) =2004027290a(17) =5921235386a(18) =17582026778a(19) =52382735162a(20) =156421528730a(21) =467811246266
External references
- oeis: A253499