65421

Appears in sequences

• Dealing cards in a game of solitaire.at n=18A071761
• Triangle read by rows: the n-th row contains n numbers sorted in decreasing value, each build by dropping a different number from the sequence [n,n-1,n-2,....,1] and concatenating the n-1 others. By definition the first row contains 0.at n=17A081541
• G.f.: x = Sum_{n>=1} a(n)*x^n/(1 + n*(n+1)/2*x)^n.at n=5A196304
• Number of quadrilateral regions in a "frame" of size n X n (see Comments in A331776 for definition), divided by 8.at n=34A332596
• Number of integer partitions of n having a permutation with all equal run-lengths.at n=45A383013