90126

Appears in sequences

• a(n) = a(n-1) + a(n-2) + n + 3 with n>1, a(0)=1, a(1)=2.at n=20A210729
• Triangle read by rows: R*(n,k) (n>=2, k from 2 to n-1 or to 2 if n = 2), where R*(n,k) = number of trees with n nodes and k unlabeled end-nodes.at n=50A213262
• Row 3 of A328464: a(n) = A276156(8n - 4) / 6.at n=26A328466
• Square array A(n,k), n>=0, k>=0, read by antidiagonals downwards, where column k is the expansion of 1/(1 - k*x) * Product_{j=0..k-1} (1 + j*x)/(1 - j*x).at n=59A383818