55369

Appears in sequences

• Number of n X n binary arrays symmetric under 90 degree rotation with all ones connected only in a 1100-1111 pattern in any orientation.at n=13A146230
• a(n) is the smallest number which is the sum of two positive n-gonal numbers in more than one way.at n=24A199809
• a(n) = (8*n^3 + 15*n^2 + 13*n)/6.at n=34A332698