Number of (n+1) X (4+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally, vertically and ne-to-sw antidiagonally.
A253491
Number of (n+1) X (4+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) =3639a(1) =5386a(2) =6476a(3) =10477a(4) =19475a(5) =40117a(6) =89339a(7) =211597a(8) =527555a(9) =1373797a(10) =3709259a(11) =10309117a(12) =29295635a(13) =84629077a(14) =247377179a(15) =729117037a(16) =2161327715a(17) =6431941957a(18) =19191749099a(19) =57367099357a(20) =171685007795a(21) =514222448437
External references
- oeis: A253491