a(n) = 1*7^n + 2*6^n + 3*5^n + 4*4^n + 5*3^n + 6*2^n + 7*1^n.
A254145
a(n) = 1*7^n + 2*6^n + 3*5^n + 4*4^n + 5*3^n + 6*2^n + 7*1^n.
Terms
- a(0) =28a(1) =84a(2) =336a(3) =1596a(4) =8400a(5) =47244a(6) =278256a(7) =1695036a(8) =10592400a(9) =67518444a(10) =437200176a(11) =2867080476a(12) =18997064400a(13) =126948964044a(14) =854359702896
External references
- oeis: A254145