21930

Appears in sequences

• a(n) = number of (s(0), s(1), ..., s(2*n-1)) such that s(i) is a nonnegative integer and |s(i) - s(i-1)| = 1 for i = 1,2,...,n, s(0) = 3, s(2*n-1) = 4. Also a(n) = T(2*n-1,n-1), where T is defined in A026022.at n=8A026026
• T(n,[ n/2 ]), where T is defined in A026022.at n=17A026034
• Numbers whose base-2 representation has exactly 14 runs.at n=11A043581
• Numbers whose base-4 representation contains exactly four 1's and four 2's.at n=0A045109
• T(n, k) = S(2*n + 1, n, k + 1) for 0<=k<=n and n >= 0, array S as in A050157.at n=39A050158
• List of codewords in binary lexicode with Hamming distance 8 written as decimal numbers.at n=9A075940
• Integers k such that omega(k) = omega(k-1) + omega(k-2) + omega(k-3), where omega(n) is the number of distinct prime factors of n.at n=13A076252
• Wiener index of the n-sunlet graph.at n=31A180574
• Coefficient of x in the reduction by x^2->x+2 of the polynomial p(n,x)=1+x^n+x^(2n).at n=7A192466
• Rows of binary Walsh matrices interpreted as reverse binary numbers.at n=24A228539
• Smallest Product_{i:lambda} prime(i) for any complete partition lambda of n.at n=27A259941
• Numbers which are cyclops palindromic in their binary reflected Gray code representation.at n=7A279260
• Sum over all partitions of n of the bitwise OR of the parts.at n=25A306902
• Numbers m such that m^2+1 is prime with (m-1)^2+1 and (m+1)^2+1 semiprimes.at n=36A321795
• Heinz number of the multiset of differences between consecutive divisors of n.at n=27A328023
• Number of oriented rational links with crossing number n.at n=15A329908