221676

Appears in sequences

• Expansion of 1/((1-2x)(1-5x)(1-6x)(1-7x)).at n=5A025986
• Numbers m such that N = (am+1)(bm+1)(cm+1) is a 3-Carmichael number (A087788), where a,b,c = 1,2,55.at n=25A065696
• Number of (n+1)X(n+1) -8..8 symmetric matrices with every 2X2 subblock having sum zero and two or three distinct values.at n=10A211469
• Number of subsets of {1,...,n + 1} containing n + 1 and such that all positive differences of distinct elements are distinct.at n=39A308251
• Number of ways to fill a Young diagram with positive integers summing to n such that all rows and columns are strictly increasing.at n=41A323451