21861
domain: N
Appears in sequences
- Floor of sum of the first n^2 square roots.at n=32A138357
- Number of 1's in row n of the Kolakoski fan A143477.at n=26A143587
- Numerator of Euler(n, 4/29).at n=3A157329
- Total number of ON cells in the "Ulam-Warburton" two-dimensional cellular automaton of A147562 after A048645(n) generations.at n=30A255264
- Number of compositions of n into parts with distinct multiplicities and with exactly nine parts.at n=19A321779
- a(n) = A001045(n) + A052928(n).at n=16A340849