1391040

Appears in sequences

• Theta series of A_9 lattice.at n=15A008449
• Fibonacci sequence beginning 0, 30.at n=24A022364
• Number of permutations of n letters that contain exactly 3 distinguishable A's, 2 distinguishable B's and n-5 distinguishable other letters, where no A's are adjacent and no B's are adjacent.at n=5A266393
• a(n) = 9*8*7*6*5*4*3*2*1 + 18*17*16*15*14*13*12*11*10 + ... + (up to the n-th term).at n=13A319873