Number of subsets of {1..n} such that it is not possible to choose a different binary index of each element.
A370637
Number of subsets of {1..n} such that it is not possible to choose a different binary index of each element.
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =8a(6) =25a(7) =67a(8) =134a(9) =309a(10) =709a(11) =1579a(12) =3420a(13) =7240a(14) =15077a(15) =30997a(16) =61994a(17) =125364a(18) =253712a(19) =512411a(20) =1032453a(21) =2075737a(22) =4166469a(23) =8352851a(24) =16731873a(25) =33497422a(26) =67038086a(27) =134130344a(28) =268328977a(29) =536741608
External references
- oeis: A370637