86240

Appears in sequences

• a(n) = A000043(n) - 3.at n=26A139480
• Partition number array, called M32(-2), related to A004747(n,m) = |S2(-2;n,m)| (generalized Stirling triangle).at n=30A143172
• A partition product of Stirling_2 type [parameter k = 2] with biggest-part statistic (triangle read by rows).at n=26A157402
• Expansion of ( 1+x^2 ) / ( 1-4*x+5*x^2-4*x^3 ).at n=11A271898
• a(0) = a(1) = 1; a(n) = 2 * Sum_{k=0..n-2} a(k) * a(n-k-2).at n=13A354733
• Numbers k such that A360327(k) = A360327(k+1) > 1.at n=23A360358
• Numbers k such that k, k+1 and k+2 have exactly 4 distinct prime factors.at n=24A364309