Number of length-(n+1) 0..2 arrays with new values introduced in sequential order, and with new repeated values introduced in sequential order, both starting with zero.
A268321
Number of length-(n+1) 0..2 arrays with new values introduced in sequential order, and with new repeated values introduced in sequential order, both starting with zero.
Terms
- a(0) =2a(1) =4a(2) =10a(3) =25a(4) =66a(5) =177a(6) =485a(7) =1348a(8) =3797a(9) =10812a(10) =31076a(11) =90015a(12) =262432a(13) =769199a(14) =2264475a(15) =6690450a(16) =19825011a(17) =58884842a(18) =175238730a(19) =522316253a(20) =1558776782a(21) =4656673837a(22) =13922711281a(23) =41654206400a(24) =124688153137a(25) =373402997944
External references
- oeis: A268321