Number of (n+1) X (1+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally and vertically.
A253449
Number of (n+1) X (1+1) 0..2 arrays with every 2 X 2 subblock diagonal minus antidiagonal sum nondecreasing horizontally and vertically.
Terms
- a(0) =81a(1) =414a(2) =1388a(3) =3639a(4) =8501a(5) =19701a(6) =48293a(7) =126357a(8) =346997a(9) =982677a(10) =2837237a(11) =8295957a(12) =24462197a(13) =72541077a(14) =215938037a(15) =644449557a(16) =1926625397a(17) =5766435477a(18) =17272430837a(19) =51763547157a(20) =155183156597a(21) =465334505877
External references
- oeis: A253449