Number of subsets of {1,2,...,n} in which exactly half of the elements are less than or equal to sqrt(n).
A102366
Number of subsets of {1,2,...,n} in which exactly half of the elements are less than or equal to sqrt(n).
Terms
- a(0) =1a(1) =1a(2) =2a(3) =3a(4) =6a(5) =10a(6) =15a(7) =21a(8) =28a(9) =84a(10) =120a(11) =165a(12) =220a(13) =286a(14) =364a(15) =455a(16) =1820a(17) =2380a(18) =3060a(19) =3876a(20) =4845a(21) =5985a(22) =7315a(23) =8855a(24) =10626a(25) =53130a(26) =65780a(27) =80730a(28) =98280a(29) =118755
External references
- oeis: A102366