A037667 Base 4 digits are, in order, the first n terms of the periodic sequence with initial period 3,2,0.

3, 14, 56, 227, 910, 3640, 14563, 58254, 233016, 932067, 3728270, 14913080, 59652323, 238609294, 954437176, 3817748707, 15270994830, 61083979320, 244335917283, 977343669134, 3909374676536, 15637498706147, 62549994824590, 250199979298360, 1000799917193443

Offset: 1

Author

Clark Kimberling

Keywords

• nonn
• base
• easy

Examples

			Terms in base 4: 3, 32, 320, 3203, 32032, 320320, 3203203, 32032032, 320320320, ... .
		

Links

• Index entries for linear recurrences with constant coefficients, signature (4,0,1,-4).

Formula

G.f.: x*(3+2*x) / ( (x-1)*(4*x-1)*(1+x+x^2) ). - R. J. Mathar, Apr 30 2015