237541

Appears in sequences

• Number of unrooted quartic trees with n (unlabeled) nodes and possessing a centroid; number of n-carbon alkanes C(n)H(2n +2) with a centroid ignoring stereoisomers.at n=19A010372
• Number of n X 2 0..1 arrays with each 1 horizontally, vertically or antidiagonally adjacent to 1 or 3 neighboring 1's.at n=14A296390
• a(n) = A005117(A390138(n) + 1).at n=41A390241