Nearest integer to n^7/49.

Terms

a(0) =0a(1) =3a(2) =45a(3) =334a(4) =1594a(5) =5713a(6) =16807a(7) =42799a(8) =97612a(9) =204082a(10) =397697a(11) =731261a(12) =1280582a(13) =2151296a(14) =3486926a(15) =5478275a(16) =8374259a(17) =12494286a(18) =18242280a(19) =26122449a(20) =36756909a(21) =50905263a(22) =69486234a(23) =93601458a(24) =124561543a(25) =163914493a(26) =213476596a(27) =275365888