74784

Appears in sequences

• Self-convolution forms A093638.at n=9A093639
• Smaller member of an infinitary amicable pair.at n=16A126169
• Infinitary amicable numbers.at n=31A127664
• a(n) = 1 + (1200 + (634 + (225 + (85 + (15 + n)*n)*n)*n)*n)*n/720.at n=17A145128
• Number of (n+2)X4 binary matrices with every 3X3 block having exactly four 1's.at n=6A181256
• Number of (n+2)X9 binary matrices with every 3X3 block having exactly four 1's.at n=1A181261
• T(n,k) = number of (n+2) X (k+2) binary matrices with every 3 X 3 block having exactly four 1's.at n=29A181262
• T(n,k) = number of (n+2) X (k+2) binary matrices with every 3 X 3 block having exactly four 1's.at n=34A181262
• Number of set partitions C_t(n) of {1,2,...,t} into at most n parts, with an even number of elements in each part distinguished by marks; triangle C_t(n), t>=0, 0<=n<=t, read by rows.at n=41A261275
• Expansion of Product_{k>0} (1 - q^(3*k))^5/((1 - q^k)^3*(1 - q^(6*k))^2).at n=22A293423