30056
domain: N
Appears in sequences
- Second differences of Catalan numbers A000108.at n=9A026012
- a(n) = T(n, [n/2]), where T is the array defined in A026009.at n=18A026021
- Expansion of (1+x^3*C^4)*C, where C = (1-(1-4*x)^(1/2))/(2*x) is g.f. for Catalan numbers, A000108.at n=10A071738
- Indices of primes in the sequence defined by A(0) = 23, A(n) = 10*A(n-1) + 63 for n > 0.at n=15A101973
- a(n) = 225*n^2 - 199*n + 44.at n=12A156812
- Number of n X n symmetric (0,1)-matrices containing four ones.at n=16A185355
- Number of nX7 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 1 1 vertically.at n=4A207588
- Number of 5 X n 0..1 arrays avoiding 0 0 0 and 0 0 1 horizontally and 0 0 1 and 1 1 1 vertically.at n=6A207592
- n! mod n^3.at n=33A242427
- a(n) = 26*n^2.at n=34A244633
- Numbers k for which A003415(k) >= A276086(k) > k, where A003415 is the arithmetic derivative and A276086 is the primorial base exp-function.at n=10A351229
- Numbers k such that A322582(k) <= A276086(k) <= A348507(k).at n=34A392602