Number of LEGO towers, one piece per floor, where every floor is perpendicular to the one below it (so we have a kind of 3-dimensional zigzag pattern).
A082679
Number of LEGO towers, one piece per floor, where every floor is perpendicular to the one below it (so we have a kind of 3-dimensional zigzag pattern).
Terms
- a(0) =0a(1) =1a(2) =2a(3) =6a(4) =20a(5) =69a(6) =241a(7) =845a(8) =2966a(9) =10414a(10) =36568a(11) =128409a(12) =450913a(13) =1583401a(14) =5560186a(15) =19524854a(16) =68562444a(17) =240760253a(18) =845440977a(19) =2968805845a(20) =10425101678a(21) =36608235998a(22) =128551546480a(23) =451414815601
External references
- oeis: A082679