20319

Appears in sequences

• Number of ways to partition n elements into pie slices each with an odd number of elements allowing the pie to be turned over.at n=28A032277
• Numbers k such that 161*2^k+1 is prime.at n=21A032457
• a(n) = A077702(n+1)/A077702(n).at n=18A077703
• a(n) = A088418(n+1)/A088418(n).at n=18A088419
• Triangle read by rows: T(n,k) is the number of Dyck paths of semilength n having k ascents of length 2 starting at an odd level (0<=k<=floor(n/2)-1 for n>=2; k=0 for n=0,1).at n=34A114463
• Number of n-bead two-color bracelets with 00 prohibited.at n=27A129526
• Multiplicity of the zero at x=1 of the characteristic polynomial P_n^{C0+}.at n=28A246998
• Prime time numbers on 6-digit clocks: numbers of the form HMMSS where H, MM, SS are primes, H < 24, MM and SS < 60.at n=24A295014
• a(n) = a(n-1) + 3*a(n-2) -2*a(n-3) - 2*a(n-4), where a(0) = -2, a(1) = -1, a(2) = 0, a(3) = 1.at n=18A295861
• Expansion of Product_{k>=1} 1/(1 - x^k)^A000593(k).at n=19A301799
• Triangle read by rows where row n is the largest (or middle or n-th) column of the reverse pyramid summation of order n described in A359087.at n=62A360145