Number of partitions of n with n kinds of 1.

Terms

a(0) =1a(1) =1a(2) =4a(3) =14a(4) =51a(5) =188a(6) =702a(7) =2644a(8) =10026a(9) =38223a(10) =146359a(11) =562456a(12) =2168134a(13) =8379539a(14) =32459199a(15) =125984039a(16) =489837300a(17) =1907490728a(18) =7438346255a(19) =29042470132a(20) =113522618066a(21) =444199913556