Number of nX4 0..1 arrays with every element equal to 1, 2 or 3 king-move adjacent elements, with upper left element zero.
A297819
Number of nX4 0..1 arrays with every element equal to 1, 2 or 3 king-move adjacent elements, with upper left element zero.
Terms
- a(0) =2a(1) =49a(2) =146a(3) =466a(4) =1395a(5) =4306a(6) =13417a(7) =41512a(8) =128084a(9) =395130a(10) =1219746a(11) =3768063a(12) =11642142a(13) =35964517a(14) =111087880a(15) =343131807a(16) =1059922547a(17) =3274149571a(18) =10114014322a(19) =31242498943a(20) =96508734369a(21) =298117843290a(22) =920895161362
External references
- oeis: A297819