Value of an urn with n balls of type -1 and n+2 balls of type +1.
A003125
Value of an urn with n balls of type -1 and n+2 balls of type +1.
Terms
- a(0) =2a(1) =9a(2) =36a(3) =142a(4) =558a(5) =2189a(6) =8594a(7) =33796a(8) =133097a(9) =524743a(10) =2070466a(11) =8177715a(12) =32332378a(13) =127948218a(14) =506708043a(15) =2007924808a(16) =7960694208a(17) =31576775077a(18) =125313590701a(19) =497543433995
External references
- oeis: A003125