5726491990

Appears in sequences

• M(M-1)/3, where M is Mersenne prime A000668(n).at n=5A139225
• Second elementary symmetric function of the first n terms of (1,2,4,8,...).at n=15A203241
• 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=31A274868