Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3, 6 or 7 king-move adjacent elements, with upper left element zero.
A306048
Number of nX3 0..1 arrays with every element unequal to 0, 1, 2, 3, 6 or 7 king-move adjacent elements, with upper left element zero.
Terms
- a(0) =4a(1) =21a(2) =45a(3) =142a(4) =439a(5) =1261a(6) =3826a(7) =11770a(8) =35152a(9) =106027a(10) =323339a(11) =977445a(12) =2953775a(13) =8969080a(14) =27186554a(15) =82305975a(16) =249564286a(17) =756677843a(18) =2292774262a(19) =6949799639a(20) =21069414963a(21) =63860628612a(22) =193568100369a(23) =586780928193
External references
- oeis: A306048