Number of nX3 0..1 arrays with every element unequal to 0, 1, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
A318032
Number of nX3 0..1 arrays with every element unequal to 0, 1, 3 or 4 horizontally, vertically or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =3a(1) =6a(2) =9a(3) =25a(4) =58a(5) =152a(6) =368a(7) =904a(8) =2211a(9) =5420a(10) =13257a(11) =32485a(12) =79687a(13) =195459a(14) =479166a(15) =1174486a(16) =2879048a(17) =7057869a(18) =17302114a(19) =42416167a(20) =103983959a(21) =254916060a(22) =624918591a(23) =1531968302a(24) =3755586548a(25) =9206752113a(26) =22570177681a(27) =55330344496a(28) =135641228111
External references
- oeis: A318032