A176710 Mix A001021, 2*A001021.

1, 2, 12, 24, 144, 288, 1728, 3456, 20736, 41472, 248832, 497664, 2985984, 5971968, 35831808, 71663616, 429981696, 859963392, 5159780352, 10319560704, 61917364224, 123834728448, 743008370688, 1486016741376, 8916100448256, 17832200896512, 106993205379072, 213986410758144

Offset: 0

Author

Paul Curtz, Apr 24 2010

Keywords

• nonn
• easy

Comments

Divides A091137. See A165313.

Links

• Index entries for linear recurrences with constant coefficients, signature (0,12).
• Index to divisibility sequences

Programs

Mathematica

LinearRecurrence[{0, 12}, {1, 2}, 30] (* Paolo Xausa, Jan 29 2024 *)

Formula

a(n)= +12*a(n-2). G.f.: ( -1-2*x ) / ( -1+12*x^2 ). [R. J. Mathar, Apr 26 2010]

Extensions

a(21)-a(27) from Paolo Xausa, Jan 29 2024