18380

Appears in sequences

• a(n) = T(n,0) + T(n,1) + ... + T(n,n), T given by A027170.at n=11A027178
• Start with n, apply k->2k+1 until reach new record prime; sequence gives number of steps needed.at n=13A051918
• Number of quasi-pentominoes in an n X n bounding box.at n=6A094172
• Sum of diagonal numbers in a Pascal-like triangle with index of asymmetry y = 3 and index of obliquity z = 0 (going upwards, left to right).at n=16A141072
• Number T(n,k) of tilings of a 5 X n rectangle with pentominoes of any shape and exactly k pentominoes of shape L; triangle T(n,k), n>=0, 0<=k<=n, read by rows.at n=31A247704
• Number of terms in n-th order nested Lie bracket.at n=9A255502
• Number of (n+2)X(4+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011.at n=4A260280
• Number of (n+2)X(5+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011.at n=3A260281
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011.at n=31A260284
• T(n,k)=Number of (n+2)X(k+2) 0..1 arrays with each 3X3 subblock having clockwise perimeter pattern 00000000 00000001 or 00001011.at n=32A260284
• Sum of the squares of the larger parts of the partitions of 2n into two squarefree parts.at n=23A280322
• Number of 2 X 2 matrices with all terms in {-n,...,0,...,n} and (sum of terms) = permanent.at n=35A280914
• a(n) = (8 - 2*n + 11*n^2 - 6*n^3 + n^4)/4.at n=17A289121
• Number of (strict) compositions of n whose differences of all degrees are nonzero.at n=20A325851