Fourth partial sums of seventh powers (A001015).

Terms

a(0) =1a(1) =132a(2) =2709a(3) =26432a(4) =168126a(5) =804552a(6) =3136014a(7) =10459968a(8) =30856839a(9) =82407052a(10) =202678203a(11) =465069696a(12) =1005729452a(13) =2066218896a(14) =4058958828a(15) =7664805504a(16) =13974953853a(17) =24692818836a(18) =42415687153a(19) =71020845504a(20) =116186669130a(21) =186085891160a(22) =292296070170a(23) =450981236160a(24) =684408934755