Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,0,1,1,1 for x=0,1,2,3,4.
A197403
Number of n X 2 0..4 arrays with each element x equal to the number its horizontal and vertical neighbors equal to 3,0,1,1,1 for x=0,1,2,3,4.
Terms
- a(0) =3a(1) =9a(2) =20a(3) =71a(4) =227a(5) =664a(6) =2107a(7) =6675a(8) =20696a(9) =65029a(10) =205057a(11) =643930a(12) =2026105a(13) =6384135a(14) =20104382a(15) =63329883a(16) =199576691a(17) =628932096a(18) =1982100085a(19) =6247388117a(20) =19691746204a(21) =62069757373a(22) =195654894641a(23) =616749232724
External references
- oeis: A197403