A326507 Number of (binary) max-heaps on n elements from the set {0,1} containing exactly six 0's.

1, 1, 2, 5, 9, 16, 27, 44, 68, 114, 156, 236, 325, 500, 622, 900, 1143, 1659, 1954, 2731, 3277, 4564, 5185, 7040, 8114, 10948, 12124, 16058, 17977, 23640, 25692, 33304, 36493, 46965, 50322, 64017, 69025, 87208, 92423, 115652, 123168, 153142, 160908, 198440

Offset: 6

Author

Alois P. Heinz, Jul 09 2019

Keywords

• nonn
• easy

Links

• Alois P. Heinz, Table of n, a(n) for n = 6..10000
• Eric Weisstein's World of Mathematics, Heap
• Wikipedia, Binary heap
• Index entries for linear recurrences with constant coefficients, signature (1, 2, -2, 3, -3, -8, 8, -2, 2, 12, -12, -2, 2, -8, 8, 3, -3, 2, -2, -1, 1).

Crossrefs

Column k=6 of A309049.

Programs

Mathematica

LinearRecurrence[{1, 2, -2, 3, -3, -8, 8, -2, 2, 12, -12, -2, 2, -8, 8, 3, -3, 2, -2, -1, 1},{1, 1, 2, 5, 9, 16, 27, 44, 68, 114, 156, 236, 325, 500, 622, 900, 1143, 1659, 1954, 2731, 3277},50] (* Ray Chandler, Sep 25 2022 *)