204512
domain: N
Appears in sequences
- Expansion of e.g.f.: sinh(exp(x)-cos(x))=x+2/2!*x^2+2/3!*x^3+12/4!*x^4+72/5!*x^5...at n=10A013315
- a(1)=1; a(n) is the smallest integer > a(n-1) such that the sum of elements of the simple continued fraction for S(n)=1/a(1)+1/a(2)+...+1/a(n) equals n^2.at n=24A071183
- Triangle T(n,k), 0<=k<=n, defined by T(n,k) = 0 if k<0 or k>n, T(0,0) = 1, T(n,k) = T(n,k-1)+T(n-1,k-1)+T(n-1,k)+T(n-1,k+1).at n=33A122479
- Smaller member of an infinitary amicable pair.at n=28A126169
- Number of (n+2)X(n+2) symmetric binary matrices without the pattern 1 1 1 diagonally, vertically or horizontally.at n=3A190421
- Number of (n+5)X(n+5) 0..2 matrices with each 6X6 subblock idempotent.at n=2A224628
- Number of (n+5)X8 0..2 matrices with each 6X6 subblock idempotent.at n=2A224631
- T(n,k)=Number of (n+5)X(k+5) 0..2 matrices with each 6X6 subblock idempotent.at n=12A224636