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A367189
Number of partitions of 2n into n divisors of 2n.
2
1, 1, 1, 2, 2, 2, 8, 2, 4, 9, 9, 2, 36, 2, 10, 45, 12, 2, 104, 2, 54, 69, 15, 2, 289, 15, 16, 100, 83, 2, 1322, 2, 47, 136, 21, 99, 1963, 2, 22, 179, 568, 2, 3168, 2, 158, 3159, 27, 2, 4637, 23, 480, 282, 207, 2, 6579, 189, 1046, 343, 33, 2, 82522, 2, 34, 7361
OFFSET
0,4
LINKS
FORMULA
a(n) = A320638(2n,n).
a(n) = 2 <=> n = 4 or n in { A065091 }.
EXAMPLE
a(6) = 8: 222222, 322221, 332211, 333111, 422211, 432111, 441111, 621111.
a(7) = 2: 2222222, 7211111.
a(8) = 4: 22222222, 42222211, 44221111, 82111111.
a(9) = 9: 222222222, 322222221, 332222211, 333222111, 333321111, 622221111, 632211111, 633111111, 921111111.
a(10) = 9: 2222222222, 4222222211, 4422221111, 4442111111, 5222222111, 5422211111, 5441111111, 5522111111, (10)211111111.
CROSSREFS
Sequence in context: A137508 A055921 A029605 * A054271 A278245 A321026
KEYWORD
nonn
AUTHOR
Alois P. Heinz, Nov 08 2023
STATUS
approved