Number of subsets of {1..n-1} whose cardinality is one less than the length of the binary expansion of n; a(0) = 0.

A370819

Number of subsets of {1..n-1} whose cardinality is one less than the length of the binary expansion of n; a(0) = 0.

Terms

    a(0) =0a(1) =1a(2) =1a(3) =2a(4) =3a(5) =6a(6) =10a(7) =15a(8) =35a(9) =56a(10) =84a(11) =120a(12) =165a(13) =220a(14) =286a(15) =364a(16) =1365a(17) =1820a(18) =2380a(19) =3060a(20) =3876a(21) =4845a(22) =5985a(23) =7315a(24) =8855a(25) =10626a(26) =12650a(27) =14950a(28) =17550a(29) =20475

External references