Number of n X 2 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.
A284193
Number of n X 2 0..1 arrays with the number of 1's horizontally, antidiagonally or vertically adjacent to some 0 equal to the number of 0's adjacent to some 1, with top left element zero.
Terms
- a(0) =2a(1) =4a(2) =13a(3) =40a(4) =131a(5) =455a(6) =1611a(7) =5818a(8) =21328a(9) =78965a(10) =294721a(11) =1107257a(12) =4182655a(13) =15873631a(14) =60485153a(15) =231287810a(16) =887184904a(17) =3412621088a(18) =13159857176a(19) =50862414259a(20) =196984720481a(21) =764321821293
External references
- oeis: A284193