Number of bracketings of 0#0#0#...#0 giving result 0, where 0#0 = 0#1 = 1#0 = 1, 1#1 = 0.

A055395

Number of bracketings of 0#0#0#...#0 giving result 0, where 0#0 = 0#1 = 1#0 = 1, 1#1 = 0.

Terms

    a(0) =1a(1) =0a(2) =0a(3) =1a(4) =4a(5) =12a(6) =36a(7) =116a(8) =392a(9) =1350a(10) =4696a(11) =16500a(12) =58572a(13) =209824a(14) =757440a(15) =2752185a(16) =10057636a(17) =36943044a(18) =136319052a(19) =505086728a(20) =1878395920a(21) =7009239644a(22) =26235435248a(23) =98475145476a(24) =370584275964

External references