Sum sequence A000522 then subtract 0,1,2,3,4,5,...

A121726

Sum sequence A000522 then subtract 0,1,2,3,4,5,...

Terms

    a(0) =1a(1) =2a(2) =6a(3) =21a(4) =85a(5) =410a(6) =2366a(7) =16065a(8) =125665a(9) =1112074a(10) =10976174a(11) =119481285a(12) =1421542629a(13) =18348340114a(14) =255323504918

External references