Number of arrangements of n indistinguishable balls in n boxes with the maximum number of balls in any box equal to 2.
A180282
Number of arrangements of n indistinguishable balls in n boxes with the maximum number of balls in any box equal to 2.
Terms
- a(0) =2a(1) =6a(2) =18a(3) =50a(4) =140a(5) =392a(6) =1106a(7) =3138a(8) =8952a(9) =25652a(10) =73788a(11) =212940a(12) =616226a(13) =1787606a(14) =5196626a(15) =15134930a(16) =44152808a(17) =128996852a(18) =377379368a(19) =1105350728a(20) =3241135526a(21) =9513228122a(22) =27948336380a(23) =82176836300a(24) =241813226150a(25) =712070156202
External references
- oeis: A180282