Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 3 X 3 plus 2,1 2,2 2,3 1,2 3,2.
A145999
Number of n X n binary arrays symmetric under horizontal and vertical reflection with all ones connected only in a 3 X 3 plus 2,1 2,2 2,3 1,2 3,2.
Terms
- a(0) =1a(1) =1a(2) =2a(3) =1a(4) =2a(5) =1a(6) =7a(7) =2a(8) =23a(9) =5a(10) =132a(11) =12a(12) =836a(13) =51a(14) =8563a(15) =317a(16) =115954a(17) =2654a(18) =2274857a(19) =30351a(20) =60964251a(21) =489559a(22) =2304941344a(23) =11104536a(24) =120886008663a(25) =350752586a(27) =15493779226a(29) =954798521885
External references
- oeis: A145999