Number of sequences of n coin flips that win on the last flip, if the sequence of flips ends with (0,0,1,1).
A199925
Number of sequences of n coin flips that win on the last flip, if the sequence of flips ends with (0,0,1,1).
Terms
- a(0) =0a(1) =0a(2) =0a(3) =1a(4) =2a(5) =4a(6) =8a(7) =14a(8) =25a(9) =45a(10) =80a(11) =142a(12) =253a(13) =450a(14) =800a(15) =1423a(16) =2531a(17) =4501a(18) =8005a(19) =14237a(20) =25320a(21) =45031a(22) =80087a(23) =142433a(24) =253314a(25) =450514a(26) =801230a(27) =1424971a(28) =2534282a(29) =4507169
External references
- oeis: A199925