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A080978
a(n) = 2*A006046(n) + 1.
4
1, 3, 7, 11, 19, 23, 31, 39, 55, 59, 67, 75, 91, 99, 115, 131, 163, 167, 175, 183, 199, 207, 223, 239, 271, 279, 295, 311, 343, 359, 391, 423, 487, 491, 499, 507, 523, 531, 547, 563, 595, 603, 619, 635, 667, 683, 715, 747, 811, 819, 835, 851, 883, 899, 931, 963
OFFSET
0,2
COMMENTS
The number of edges in A080973-trees.
Conjectured partial sums of A131136. - Sean A. Irvine, Jun 25 2022
LINKS
Hsien-Kuei Hwang, Svante Janson, and Tsung-Hsi Tsai, Identities and periodic oscillations of divide-and-conquer recurrences splitting at half, arXiv:2210.10968 [cs.DS], 2022, pp. 6, 30.
MATHEMATICA
Map[2 # + 1 &, {0}~Join~Accumulate@ Map[Count[#, _?OddQ] &, Table[Binomial[n, k], {n, 0, 54}, {k, 0, n}]]] (* Michael De Vlieger, Oct 30 2022 *)
CROSSREFS
Sequence in context: A085760 A179481 A131426 * A160216 A181516 A285015
KEYWORD
nonn
AUTHOR
Antti Karttunen, Mar 02 2003
STATUS
approved