165188

Appears in sequences

• Number of slanted n X 4 (i=1..n) X (j=i..4+i-1) 1..4 arrays with all 1s connected, all 2s connected, all 3s connected, all 4s connected, 1 in the upper left corner, 2 in the upper right corner, 3 in the lower left corner, 4 in the lower right corner, and with no element having more than 3 neighbors with the same value.at n=21A165381
• a(n) = (3*n^4 - 4*n^3 + n^2 + 4*n + 4)/4.at n=22A366478