31032

Appears in sequences

• Coefficients for numerical integration.at n=5A002686
• Sequence of sums based on primes = 7 mod 8.at n=36A060108
• a(1)=0, a(2)=1; for n>2, a(n) = C(n,2)*(1+a(n-2)).at n=8A126725
• Pentagonal numbers (A000326) which are the sum of 2 other positive pentagonal numbers.at n=35A136117
• a(n) = 6^n-5^n+1^n.at n=6A155639
• Index of first occurrence of 2n in A031883, or 0 if 2n never occurs in A031883 = first differences of lucky numbers A000959.at n=39A181558
• Number of n X 5 0..1 arrays with every row and column running average nondecreasing rightwards and downwards, and the number of instances of each value within one of each other.at n=38A201501
• a(n) is the number of terms in the expansion of (x-y)*(x^4-y^4)*(x^9-y^9)*...*(x^(n^2)-y^(n^2)).at n=44A225549
• Pentagonal numbers that are also Niven numbers.at n=38A242043
• Number of (n+2) X (1+2) 0..1 arrays with no 3 x 3 subblock diagonal sum 3 and no antidiagonal sum 3 and no row sum 0 and no column sum 0.at n=6A256741
• Number of (n+2)X(7+2) 0..1 arrays with no 3x3 subblock diagonal sum 3 and no antidiagonal sum 3 and no row sum 0 and no column sum 0.at n=0A256747
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with no 3x3 subblock diagonal sum 3 and no antidiagonal sum 3 and no row sum 0 and no column sum 0.at n=21A256748
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with no 3x3 subblock diagonal sum 3 and no antidiagonal sum 3 and no row sum 0 and no column sum 0.at n=27A256748
• a(n) = n^2*(3*n^2 - 1)/2.at n=12A260810
• Triangle T(n,k) read by rows: coefficients of polynomials P_n(t) defined in Formula section.at n=38A287040
• Pentagonal numbers divisible by 4.at n=36A298397
• Triangle T(n,k), read by rows: coefficients for numerical integration near a singularity (n >= 0 and 0 <= k <= n).at n=26A324124
• Improved version of A002686; secondary main diagonal of A324124.at n=5A328885
• Pentagonal numbers that are abundant.at n=48A379264