Number of n X n binary arrays, symmetric under 180 degree rotation, with every 1 adjacent to at least one other 1 both bishopwise and rookwise but with no three 1s in a row bishopwise or rookwise.
A144244
Number of n X n binary arrays, symmetric under 180 degree rotation, with every 1 adjacent to at least one other 1 both bishopwise and rookwise but with no three 1s in a row bishopwise or rookwise.
Terms
- a(0) =1a(1) =2a(2) =1a(3) =9a(4) =24a(5) =94a(6) =870a(7) =7731a(8) =58940a(9) =1518701a(10) =25116276a(11) =780979887a(12) =31966477480
External references
- oeis: A144244