122409

Appears in sequences

• 4-dimensional figurate numbers: a(n) = (5*n-1)*binomial(n+2,3)/4.at n=27A002418
• a(n) = C(n+2, 2) + C(n+2, 3) + C(n+2, 4) + C(n+2, 5).at n=26A027660
• Expansion of 1/(1 - x*Product_{k>=1} (1 - x^k)).at n=34A299105