click to show generating function Search the OEIS for these generating functions Search the Online Encyclopedia of Integer Sequences for the coefficients of a few of the first generating functions, in the case at hand: 1,1 1,1,2,1 1,1,2,4,2,3,1 1,1,2,4,6,6,6,8,3,4,1 1,1,2,4,6,11,10,15,15,19,14,11,13,4,5,1 1,1,2,4,6,11,16,20,24,35,35,45,40,41,37,39,24,17,19,5,6,1
O9QIM6O9QIM1O9QIM9O9QIM4O9QIMTO9QIMRO9QIMNO9QIMBO9QIMMO9QIM5O9QIMFO9QIMOO9QIMKO9QIM0O9QIMLO9QIM3O9QIMDO9QIMSO9QIMQO9QIMVO9QIMIO9QIMXO9QIMAO9QIM8O9QIMEO9QIMCO9QIM7O9QIMYO9QIMGO9QIMHO9QIM2O9QIM1