Equals two maps: number of nX2 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and vertical neighbors in a random 0..1 nX2 array.
A220238
Equals two maps: number of nX2 binary arrays indicating the locations of corresponding elements equal to exactly two of their horizontal and vertical neighbors in a random 0..1 nX2 array.
Terms
- a(0) =1a(1) =6a(2) =23a(3) =78a(4) =292a(5) =1066a(6) =3922a(7) =14420a(8) =53082a(9) =194996a(10) =716575a(11) =2632158a(12) =9670362a(13) =35522394a(14) =130493059a(15) =479334100a(16) =1760731483a(17) =6467453104a(18) =23755979899a(19) =87258200522a(20) =320507504035
External references
- oeis: A220238