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A037540
Base 7 digits are, in order, the first n terms of the periodic sequence with initial period 1,2,1.
0
1, 9, 64, 449, 3145, 22016, 154113, 1078793, 7551552, 52860865, 370026057, 2590182400, 18131276801, 126918937609, 888432563264, 6219027942849, 43533195599945, 304732369199616, 2133126584397313
OFFSET
1,2
FORMULA
G.f.: x*(1+x)^2 / ( (x-1)*(7*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 30 2015
CROSSREFS
Sequence in context: A357649 A231822 A049684 * A037484 A013566 A056769
KEYWORD
nonn,base,easy
STATUS
approved