Number of (n+2) X 3 binary arrays with each 3 X 3 subblock having rows and columns in lexicographically nondecreasing order.
A184540
Number of (n+2) X 3 binary arrays with each 3 X 3 subblock having rows and columns in lexicographically nondecreasing order.
Terms
- a(0) =45a(1) =89a(2) =147a(3) =220a(4) =309a(5) =415a(6) =539a(7) =682a(8) =845a(9) =1029a(10) =1235a(11) =1464a(12) =1717a(13) =1995a(14) =2299a(15) =2630a(16) =2989a(17) =3377a(18) =3795a(19) =4244a(20) =4725a(21) =5239a(22) =5787a(23) =6370a(24) =6989a(25) =7645a(26) =8339a(27) =9072a(28) =9845a(29) =10659
External references
- oeis: A184540