18322
domain: N
Appears in sequences
- a(n) = A077708(n+1)/A077708(n).at n=22A077709
- 3-comma numbers: n occurs in the sequence S[k+1]=S[k]+10*last_digit(S[k-1])+first_digit(S[k]) for three different splittings n=concat(S[0],S[1]).at n=18A166513
- a(0)=0, a(1)=6, a(n)=a(n-1)+a(n-2)-1.at n=19A187892
- Number of involutions avoiding the pattern 1342.at n=12A230553
- a(n) = ceiling(Pi*n^3).at n=18A247194
- Expansion of Product_{k>=1} (1+x^k)^k / (1-x^k).at n=15A262667
- Divide the positive integers into subsets of lengths given by successive primes. a(n) is the sum of primes contained in the n-th subset.at n=27A344718