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"Sloping septenary numbers": write numbers in septenary under each other (right-justified), read diagonals in upward direction, convert to decimal.
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%I #13 Sep 10 2019 14:16:35

%S 0,1,2,3,4,5,13,7,8,9,10,11,12,20,14,15,16,17,18,19,27,21,22,23,24,25,

%T 26,34,28,29,30,31,32,33,41,35,36,37,38,39,40,48,42,43,44,45,46,96,55,

%U 49,50,51,52,53,54,62,56,57,58,59,60,61,69,63,64,65,66,67,68,76,70,71

%N "Sloping septenary numbers": write numbers in septenary under each other (right-justified), read diagonals in upward direction, convert to decimal.

%H Seiichi Manyama, <a href="/A325693/b325693.txt">Table of n, a(n) for n = 0..10000</a>

%Y Cf. A102370 (base 2), A109681 (base 3), A325644 (base 4), A325645 (base 5), A325692 (base 6), this sequence (base 7), A325805 (base 8), A325829 (base 9), A103205 (base 10).

%K nonn,base

%O 0,3

%A _Seiichi Manyama_, Sep 07 2019