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%I #6 Feb 17 2015 20:32:19
%S 1,1,603,3907,15373,46341,117271,261703,530937,999433,1770931,2985291,
%T 4826053,7528717,11389743,16776271,24136561,34011153,47044747,
%U 63998803,85764861,113378581,148034503,191101527,244139113,308914201,387418851
%N a(n) = n^6 - 63*n + 63, with n*a(n) + n*(n-1)*63 = n^7.
%e a(2) = 1, 1 + 127 = 2^7; a(3) = 603, 603 + 729 + 855 = 3^7; a(4) = 3907, 3907 + 4033 + 4159 + 4285 = 4^7.
%K nonn
%O 1,3
%A Andras Erszegi (erszegi.andras(AT)chello.hu), May 14 2005
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