Number of partitions of n into two sorts of parts having exactly 7 parts of the second sort.

Terms

a(0) =1a(1) =9a(2) =46a(3) =175a(4) =551a(5) =1517a(6) =3775a(7) =8677a(8) =18702a(9) =38221a(10) =74670a(11) =140380a(12) =255200a(13) =450587a(14) =775050a(15) =1302820a(16) =2144491a(17) =3464614a(18) =5501502a(19) =8601609a(20) =13254960a(21) =20160072a(22) =30285308a(23) =44987881a(24) =66117110a(25) =96226698a(26) =138744972a(27) =198343467a(28) =281212898a(29) =395689440