A135926 G.f.: C_{2,o}(y) - see p. 158 of Fan reference.

3, 14, 57, 235, 969, 4014, 16695, 69678, 291609, 1223060, 5138488, 21617717, 91044538, 383775880, 1618868769, 6832842691, 28853864329, 121894728098, 515129513163, 2177588642423, 9207559005080, 38940990014941, 164721537694077, 696889444599910

Offset

0,1

References

C. K. Fan, Structure of a Hecke algebra quotient, J. Amer. Math. Soc., 10 (1997), 139-167. [See D(y) on p. 158.]

Links

Table of n, a(n) for n=0..23.

Maple

S:=sqrt(1 - 4*y);
Dy:=(y^2 + y - 1)*(1 + 2*y + S)*(1 - 5*y + 2*y^2 + (3*y - 1)*S)^2*( - 1 + 3*y + 2*y^2 + (1 - y)*S);
C:=(-8/Dy)*(6 - 77*y + 352*y^2 - 650*y^3 + 293*y^4 + 338*y^5 - 249*y^6 - 3*y^7 + 2*y^8 + ( - 6 + 65*y - 234*y^2 + 288*y^3 + 15*y^4 - 186*y^5 + 41*y^6 + 5*y^7)*S);

Crossrefs

Cf. A135925.

Sequence in context: A353095 A037793 A037093 * A015523 A127363 A133444

Adjacent sequences: A135923 A135924 A135925 * A135927 A135928 A135929

Keyword

nonn

Author

N. J. A. Sloane, Mar 09 2008

Status

approved