Number of nX4 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
A303521
Number of nX4 0..1 arrays with every element equal to 0, 1, 3, 4, 5 or 6 horizontally, diagonally or antidiagonally adjacent elements, with upper left element zero.
Terms
- a(0) =5a(1) =21a(2) =37a(3) =103a(4) =340a(5) =1115a(6) =4112a(7) =16640a(8) =71025a(9) =320957a(10) =1510853a(11) =7287031a(12) =35723065a(13) =176869202a(14) =880763327a(15) =4401181230a(16) =22037652351a(17) =110478062574a(18) =554227859714
External references
- oeis: A303521