21478

Appears in sequences

• a(n) = s(1)s(n) + s(2)s(n-1) + ... + s(k)s(n+1-k), where k = [ (n+1)/2 ], s = (composite numbers).at n=44A024588
• Sum of largest parts (counted with multiplicity) of all partitions of n into odd parts.at n=40A092310
• Number of permutations of length n which avoid the patterns 1234, 4312.at n=9A116705
• Number of 4-step S, NW and NE-moving king's tours on an n X n board summed over all starting positions.at n=29A187378
• Volume of the Johnson square pyramid (rounded down) with all the edge lengths equal to n.at n=44A229063
• a(n) = 168*2^n - 26 (n>=1).at n=6A304384
• Numbers that are the sum of eight fourth powers in exactly eight ways.at n=33A345840
• Number of tilings of a 5 X n rectangle using n pentominoes of shapes T, W, I, X.at n=26A372221