22686
domain: N
Appears in sequences
- a(n) = Sum_{k=0..n} binomial(2*n,n+k)*3^k.at n=6A100193
- 6 times centered hexagonal numbers: 18*n*(n+1) + 6.at n=35A164016
- The location of records in A210700.at n=29A210701
- Number of (w,x,y,z) with all terms in {1,...,n} and 2w=x+y+z.at n=38A212068
- Number of inequivalent ways of placing 2 nonattacking rooks on n X n board up to rotations and reflections of the board.at n=24A307304
- Total number of blocks containing only even elements in all partitions of [n].at n=9A363453