The number of subsets of the numbers {1,2,3...,n} consisting of at most 3 elements and at most two of those are even.
A204555
The number of subsets of the numbers {1,2,3...,n} consisting of at most 3 elements and at most two of those are even.
Terms
- a(0) =1a(1) =2a(2) =4a(3) =8a(4) =15a(5) =26a(6) =41a(7) =63a(8) =89a(9) =126a(10) =166a(11) =222a(12) =279a(13) =358a(14) =435a(15) =541a(16) =641a(17) =778a(18) =904a(19) =1076a(20) =1231a(21) =1442a(22) =1629a(23) =1883a(24) =2105a(25) =2406a(26) =2666a(27) =3018a(28) =3319a(29) =3726
External references
- oeis: A204555