17537553

Appears in sequences

• Number of ways to add n ordinals.at n=19A005348
• Numbers k such that k divides 9^k + 8^k + 7^k.at n=32A057231
• a(n) = 11*3^n.at n=13A120354
• Let S = smallest missing positive number, adjoin S, 3*S, 9*S, 27*S, 81*S, ... to the sequence until reaching a term that has S as a substring; reset S to the smallest missing positive number, repeat.at n=45A331631
• The number of nonequivalent root ancestral configurations in a recursively defined family of gene trees and species trees with at least n = 9 leaves, in which for n >= 12 leaves, 3-leaf trees are successively added at the root of the tree with n-3 leaves.at n=37A355118