Number of nX6 0..4 arrays with each element equal to the number its horizontal and vertical neighbors equal to itself.

A195967

Number of nX6 0..4 arrays with each element equal to the number its horizontal and vertical neighbors equal to itself.

Terms

    a(0) =2a(1) =2a(2) =25a(3) =118a(4) =417a(5) =746a(6) =2906a(7) =10899a(8) =31616a(9) =88860a(10) =304443a(11) =1013184a(12) =3033869a(13) =9608917a(14) =30808108a(15) =97784400a(16) =307889267a(17) =971517454a(18) =3088012323a(19) =9793418941a(20) =30915299775a(21) =97797652156a(22) =310274504503a(23) =981649179185

External references