2863245995

Appears in sequences

• Gaussian binomial coefficient [n, 2] for q = 2.at n=17A006095
• A Jacobsthal variant.at n=32A097038
• M(M-1)/6, where M is Mersenne prime A000668(n).at n=5A139226
• a(n) = 6*a(n-1) - 8*a(n-2) + 1 for n > 1; a(0) = 1, a(1) = 7.at n=15A171477
• Number of set partitions of [n] into exactly four blocks such that all odd elements are in blocks with an odd index and all even elements are in blocks with an even index.at n=30A274868