Number of subsets of {2..n} such that it is not possible to choose a different binary index of each element.
A370643
Number of subsets of {2..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) =0a(4) =0a(5) =1a(6) =7a(7) =23a(8) =46a(9) =113a(10) =287a(11) =680a(12) =1546a(13) =3374a(14) =7191a(15) =15008a(16) =30016a(17) =61013a(18) =124354a(19) =252577a(20) =511229a(21) =1031064a(22) =2074281a(23) =4164716a(24) =8350912a(25) =16729473a(26) =33494928a(27) =67034995a(28) =134127390a(29) =268325204
External references
- oeis: A370643