|
Search: id:A161802
|
|
|
| A161802 |
|
G.f. is Q_1(q) where q*Q_1(q^4) is a series quadrasection of the g.f. of A161800. |
|
+0
3
|
|
| 2, -16, 18, 176, -544, -160, 2834, -5104, 3232, 18032, -68992, 48400, 143074, -343088, 461344, 63888, -2298880, 2963520, 1387424, -5145536, 10416514, -9297312, -31084704, 42991712, 34760672, -51170800, 81567168, -94111088
(list; graph; listen)
|
|
|
OFFSET
|
0,1
|
|
|
COMMENT
|
The g.f. of A161800 has two nonzero series quadrasections; the other is given by A161801.
|
|
EXAMPLE
|
G.f.: Q_1(q) = 2 - 16*q + 18*q^2 + 176*q^3 - 544*q^4 - 160*q^5 + 2834*q^6 +...
|
|
PROGRAM
|
(PARI) {a(n)=local(L=sum(m=1, 4*n+1, 2*2^valuation(m, 2)*sumdiv(m, d, -(-1)^d*d)*x^m/m)+x*O(x^(4*n+1))); polcoeff(exp(L), 4*n+1)}
|
|
CROSSREFS
|
Cf. A161800, A161801.
Sequence in context: A114974 A101075 A022370 this_sequence A050850 A082475 A081767
Adjacent sequences: A161799 A161800 A161801 this_sequence A161803 A161804 A161805
|
|
KEYWORD
|
sign
|
|
AUTHOR
|
Paul D. Hanna (pauldhanna(AT)juno.com), Jul 19 2009
|
|
|
Search completed in 0.002 seconds
|
