Number of (6+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.
A253500
Number of (6+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) =19701a(1) =22236a(2) =29370a(3) =40117a(4) =63550a(5) =113573a(6) =220988a(7) =457436a(8) =995132a(9) =2264924a(10) =5387708a(11) =13382876a(12) =34622012a(13) =92846684a(14) =256535228a(15) =725629916a(16) =2088972092a(17) =6091114844a(18) =17921775548a(19) =53062222556a(20) =157780493372a(21) =470529165404
External references
- oeis: A253500