Place a(n) red and b(n) blue balls in an urn; draw 3 balls without replacement; Probability(3 red balls) = Probability(1 red and 2 blue balls); binomial(a(n),3) = binomial(a(n),1)*binomial(b(n),2).
A179167
Place a(n) red and b(n) blue balls in an urn; draw 3 balls without replacement; Probability(3 red balls) = Probability(1 red and 2 blue balls); binomial(a(n),3) = binomial(a(n),1)*binomial(b(n),2).
Terms
- a(0) =3a(1) =4a(2) =11a(3) =37a(4) =134a(5) =496a(6) =1847a(7) =6889a(8) =25706a(9) =95932a(10) =358019a(11) =1336141a(12) =4986542a(13) =18610024a(14) =69453551a(15) =259204177a(16) =967363154a(17) =3610248436a(18) =13473630587a(19) =50284273909a(20) =187663465046a(21) =700369586272
External references
- oeis: A179167