42335

Appears in sequences

• Number of circular chord diagrams with n chords, up to rotational symmetry.at n=8A007474
• a(n) = p(1)p(n) + p(2)p(n-1) + ... + p(k)p(n+1-k), where k = [ (n+1)/2 ], p = A000040 = the primes.at n=34A024697
• Number of step shifted (decimated) sequence structures using a maximum of five different symbols.at n=10A056394
• Numbers k such that 21^k - 2 is a prime.at n=21A128461
• Number of n X n binary arrays symmetric about both diagonal and antidiagonal with all ones connected only either as two by three or three by two blocks.at n=17A146156
• a(n) = 24*n^2 - 1.at n=41A158544
• a(n) = 54*n^2 - 1.at n=27A158656
• Number of totally aperiodic integer partitions of n.at n=40A319811