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 A017557 12n+3. 7
 3, 15, 27, 39, 51, 63, 75, 87, 99, 111, 123, 135, 147, 159, 171, 183, 195, 207, 219, 231, 243, 255, 267, 279, 291, 303, 315, 327, 339, 351, 363, 375, 387, 399, 411, 423, 435, 447, 459, 471, 483, 495, 507, 519, 531, 543, 555, 567, 579, 591, 603, 615, 627, 639 (list; graph; refs; listen; history; text; internal format)
 OFFSET 0,1 COMMENTS Apart from initial term(s), dimension of the space of weight 2n cusp forms for Gamma_0( 44 ). A089911(2*a(n)) = 8. - Reinhard Zumkeller, Jul 05 2013 LINKS Vincenzo Librandi, Table of n, a(n) for n = 0..2000 Tanya Khovanova, Recursive Sequences William A. Stein, Dimensions of the spaces S_k(Gamma_0(N)) William A. Stein, The modular forms database Index entries for linear recurrences with constant coefficients, signature (2,-1). FORMULA a(n) = 2*a(n-1) - a(n-2). [From Vincenzo Librandi, Jun 07 2011] MATHEMATICA 12*Range[0, 200]+3 (* Vladimir Joseph Stephan Orlovsky, Feb 19 2011*) PROG (MAGMA) [12*n+3: n in [0..60]]; // Vincenzo Librandi, Jun 07 2011 (Haskell) a017557 = (+ 3) . (* 12)  -- Reinhard Zumkeller, Jul 05 2013 (PARI) a(n)=12*n+3 \\ Charles R Greathouse IV, Jul 10 2016 CROSSREFS Cf. A008594, A017533, A017545, A016813. Sequence in context: A121250 A105549 A080065 * A147041 A002259 A050848 Adjacent sequences:  A017554 A017555 A017556 * A017558 A017559 A017560 KEYWORD nonn,easy AUTHOR STATUS approved

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