Alternating sums of powers of 1,2,...,7.

Terms

a(0) =1a(1) =4a(2) =28a(3) =208a(4) =1540a(5) =11344a(6) =83188a(7) =607408a(8) =4416580a(9) =31986064a(10) =230784148a(11) =1659338608a(12) =11892395620a(13) =84983496784a(14) =605698755508