a(n) = a^a - b^b + c^c - ... -+ d^d where the decimal expansion of n is abc...d.

Terms

a(0) =1a(1) =1a(2) =4a(3) =27a(4) =256a(5) =3125a(6) =46656a(7) =823543a(8) =16777216a(9) =387420489a(10) =0a(11) =0a(12) =-3a(13) =-26a(14) =-255a(15) =-3124a(16) =-46655a(17) =-823542a(18) =-16777215a(19) =-387420488a(20) =3a(21) =3a(22) =0a(23) =-23a(24) =-252a(25) =-3121a(26) =-46652a(27) =-823539a(28) =-16777212a(29) =-387420485