26355

Appears in sequences

• Triangle read by rows: T(n,k), n >=1, 0 <= k <= C(n,k), = number of n X n symmetric positive definite matrices with 2's on the main diagonal and 1's and 0's elsewhere and with k 1's above the diagonal.at n=54A080858
• a(n) = A000217(A000217(n))-n^2.at n=21A086602
• Number of true entries in truth tables of bracketed formulas connected by modified implication (case 3).at n=8A218183
• Number of partitions of n with difference -5 between the number of odd parts and the number of even parts, both counted without multiplicity.at n=46A242687
• Partial sums of A246031.at n=19A255364
• Two-column table read by rows: Primitive distinct pairs that have the same value of phi, sigma, and tau.at n=32A322688
• Array read by falling antidiagonals: T(n,k) = numerator(Sum_{x>0} (x^n)/(k^x)); n >= 0 and k >= 2.at n=51A374895