Number of (n+1) X 2 0..1 arrays with the determinants of 2 X 2 subblocks nondecreasing rightwards and downwards.
A204609
Number of (n+1) X 2 0..1 arrays with the determinants of 2 X 2 subblocks nondecreasing rightwards and downwards.
Terms
- a(0) =16a(1) =47a(2) =125a(3) =335a(4) =907a(5) =2470a(6) =6740a(7) =18406a(8) =50278a(9) =137354a(10) =375250a(11) =1025194a(12) =2800874a(13) =7652122a(14) =20905978a(15) =57116186a(16) =156044314a(17) =426320986a(18) =1164730586a(19) =3182103130a(20) =8693667418a(21) =23751541082a(22) =64890416986a(23) =177283916122a(24) =484348666202
External references
- oeis: A204609