Number of bracketings of 0#0#0#...#0 giving result 0, where 0#0 = 1, 0#1 = 1#0 = 1#1 = 0.
A055392
Number of bracketings of 0#0#0#...#0 giving result 0, where 0#0 = 1, 0#1 = 1#0 = 1#1 = 0.
Terms
- a(0) =1a(1) =0a(2) =2a(3) =1a(4) =12a(5) =14a(6) =100a(7) =180a(8) =990a(9) =2310a(10) =10920a(11) =30030a(12) =129612a(13) =396576a(14) =1620168a(15) =5318841a(16) =21029580a(17) =72364578a(18) =280735884a(19) =997356360a(20) =3828988020a(21) =13905563100a(22) =53108050320a(23) =195875639310a(24) =746569720572
External references
- oeis: A055392